Design

"Interface": Fundamentals of Designing Humane Systems

"Interface": Fundamentals of Designing Humane Systems

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In today's world, people constantly interact with various interfaces, such as ATMs, navigation maps in shopping malls, and applications on smartphones and computers. However, not all of these systems can be considered user-friendly. It is important to design interfaces that not only provide functionality but also create a comfortable interaction, taking into account the needs and expectations of users. Improving the usability of interfaces contributes to increased customer satisfaction and the effective use of technology in everyday life. Jeff Raskin emphasized that the quality of an interface is determined by its ability to meet the needs of the user and address their weaknesses. In his book, "Interface: New Directions in Computer System Design," he explores how to apply psychological principles to the design of computer systems to solve current problems of human interaction with technology. Raskin offers methods that help create intuitive and user-friendly interfaces, thereby ensuring effective user interaction with the computer. Simvol-Plus Publishing House specializes in publishing high-quality literature in various genres. We strive to provide readers with a wide selection of books, covering both fiction and non-fiction. Our team of professionals works to ensure that each publication meets high standards and satisfies the interests of a wide range of readers. We are proud to support talented authors and contribute to the development of book culture. Browse our catalog and find books that will be interesting and useful for you. Simvol-Plus Publishing House is your reliable partner in the world of literature.

Jef Raskin was an outstanding interface designer and the founder of the Macintosh project, which became the basis for the modern Apple computer family. His innovative ideas for transforming traditional interface systems were quite bold, but many of these concepts were not implemented in the final version of the product. Nevertheless, Raskin's contribution to the development of user interfaces and computer technology remains undeniable, and his ideas continue to influence the design of modern devices.

After leaving Apple, he founded Information Appliance, where he focused on implementing his ideas. He later developed the Archy project, an innovative interface in which he sought to apply the experience he had accumulated over 30 years in the field of technology and user interfaces. Archy was a significant step in his career, reflecting his vision for usability and functionality in human-computer interaction.

Jeff's principles will help you gain a deeper understanding of human behavior and effectively apply this knowledge to interface design. Understanding how people interact with technology allows you to create more intuitive and usable systems. In today's world, navigating computer systems often feels like a maze, making it difficult to find information and complete tasks. Using Jeff's principles, designers can improve user experience by making interfaces more understandable and accessible, which, in turn, reduces stress and increases user productivity.

This article will provide information on the key aspects of this topic. We will examine important elements in detail and provide useful tips to help you better understand the subject. Read on to deepen your knowledge and get practical recommendations.

  • What are the differences between conscious and unconscious actions?
  • Why an interface can't be intuitive?
  • How user modes complicate everyone's life?
  • What can replace modern app navigation?

Basic Principles

Simplicity should be maintained even in complex systems. For example, setting the time on a mechanical watch is easy—just turn the knob and set the hand to the desired position. In contrast, on an electronic watch, the process is more complex: you need to go to the settings and figure out which buttons are responsible for setting the hours, minutes, and seconds. This difference in approach emphasizes the importance of an intuitive interface that allows the user to effectively interact with the device. Maintaining simplicity when using technology is key to making it easier and faster for people to learn how to use various gadgets.

Watches, despite their functionality remaining unchanged, have become more complex to use. Experts recommend avoiding difficulties with controls and settings. Tips for optimizing interaction with watches will help make the process more convenient and intuitive.

Among the many absurd interface designs, overcomplicating simple processes is most often the subject of ridicule in comics and comedy scenes. This phenomenon highlights how excessive complexity can lead to comical situations and misunderstandings. Simplicity and intuitiveness of interfaces play a key role in their perception by users. Simplifying interactions contributes to a more positive experience, while excessive complexity only aggravates the situation and invites criticism. Therefore, it is important to strive to create simple and clear interfaces to avoid absurdities and errors that can lead to ridicule.

Mechanical watches from 1890 and electronic watches "Elektronika" from the eighties. How to set the time on the latter is impossible to understand without instructions. Photo: Wikimedia Commons

Human-centered design is a key aspect in interface design. Jeff emphasized that specialists in various fields can significantly contribute to the creation of effective design. However, it is important to remember that they do not always have a deep understanding of human psychology. To overcome this problem, designers should first focus on the general needs and expectations of users and only then delve into the details. This approach ensures the creation of more intuitive and usable interfaces, which ultimately improves the user experience and increases customer satisfaction.

Developers often ignore important aspects of interface design, which leads to solutions that do not take into account the peculiarities of human perception. As an example, Jeff raises the topic of file naming, which many people do not pay due attention to. Proper file naming not only makes them easier to work with but also improves user interaction with the system. Understanding the human mind should be at the core of design to ensure intuitive and functional interfaces.

Most computer systems require files to have unique names. However, situations often arise when we cannot remember the name of a file, especially if we have not used it for a long time. This can make it difficult to find and organize data. To avoid such problems, it is recommended to use naming systems that make it easier to identify files.

Jef Raskin is a prominent American computer scientist and designer known for his significant contributions to the development of user interfaces and software. He co-founded the Macintosh project at Apple in the 1980s, playing a key role in creating an intuitive interface that later became the standard for many computer systems. Raskin is also known for his work on the concept of "computer science", which focuses on how people interact with computers and how technology can simplify everyday tasks. His approach to software design inspired many developers, focusing on usability and accessibility for the end user. Jef Raskin's contribution to the tech industry remains relevant today, as his ideas continue to influence modern developments in user interfaces and human-computer interaction.

To avoid the influence of names on the search for old files, Jef suggests abandoning them entirely and using content previews. People remember the overall composition of an object much better than its small details. For example, when viewing photos on a phone, attention is focused not on the names, but on the images themselves. A rough silhouette is formed in memory, which allows you to compare it with what is displayed on the screen. Using visual content instead of text labels can significantly simplify the search process and increase the efficiency of working with large amounts of information.

User data is of great importance. There are many memes about unsaved projects in Photoshop, when a designer worked on a piece for three hours, only to have all his efforts wasted due to a sudden computer shutdown. Raskin emphasizes that the interface should perceive user data as valuable and ensure its preservation under all conditions. This approach helps minimize the risk of information loss and improves the user experience. Data preservation should be a priority for developers to avoid such situations and ensure software reliability.

Asimov's First Law of Robotics can be adapted to interface design as follows: "A computer shall not harm user data, nor shall it stand by and allow harm to user data." This approach emphasizes the importance of protecting user data and the responsibility of computers when interacting with them. Data security is the foundation of trust, and interface designers should keep this principle in mind when creating intuitive and secure systems.

Jef Raskin was a renowned American designer and engineer who made significant contributions to the development of interfaces and software. He co-founded the concept of the "intuitive interface," which made computers more accessible and user-friendly for a wider audience. While working at Apple, Raskin developed the Macintosh, which changed the way users interact with computers. His ideas on graphical interfaces and the use of the mouse influenced the entire technology industry. Jef Raskin's contributions to the world of computer technology continue to be relevant and in demand, inspiring a new generation of designers and developers.

Figma automatically saves everything the user does. Screenshot: Vyacheslav Lazarev / Skillbox Media

The interface should facilitate effective problem solving. When using a new tool, it can be difficult for the user to focus on performing meaningful actions because all attention is focused on the interface itself. This distracts from the essence of the task and shifts the focus from the desired result to the process itself. In professional software solutions, this may be acceptable, but in everyday applications, the interface should not be complex and confusing. Designing an intuitive interface is important for increasing productivity and improving the user experience, allowing users to quickly and effortlessly achieve their goals.

To create an effective interface, it is necessary to understand how people and machines interact. It is important to develop the ability to recognize the difficulties users face. This is not an easy task, as we are accustomed to the way programs work and sometimes take their methods for granted. However, interfaces can often be unnecessarily complex, confusing, and inefficient, which leads to user errors. Understanding these aspects is key to developing intuitive and usable interfaces that will contribute to an improved user experience.

Jeff Raskin is a renowned American computer scientist and designer who made significant contributions to the development of user interfaces and computer technology. He was born on March 9, 1939, and became one of the key figures in the history of computer science. Raskin is known for his work on the Apple Macintosh project, which changed the approach to user interaction with a computer thanks to its graphical interface and the WYSIWYG (What You See Is What You Get) concept. His ideas on the importance of usability and intuitive design became the basis for many modern technologies. Jef Raskin is also the author of several books and articles in which he shares his views on the future of technology and its impact on society. His legacy continues to influence software development and interface design, becoming a model for new generations of developers.

Human Psychology

To create a human-centered interface, it is necessary to take into account how the human brain functions. In development, it is important to remember two key concepts from cognitive psychology: conscious and unconscious. Conscious perception includes conscious actions that a person constantly reflects on. While the unconscious refers to automatic actions that occur without awareness or thought, understanding these processes helps designers create more intuitive and effective interfaces that enhance user interactions with the product.

Unconscious processes cannot be consciously perceived. For example, unconsciously monitoring bladder pressure is a cue for awareness of the need to empty it. This interaction between the unconscious and conscious levels helps us respond to physiological needs, which is important for maintaining health and comfort.

Jeff Raskin was a prominent American computer scientist known for his significant contributions to the development of user interfaces and software. He was a pioneer in the field of graphical interfaces and played a key role in the creation of the Macintosh concept at Apple. Raskin developed principles that made computers more accessible and user-friendly, emphasizing the importance of human-machine interaction. His work continues to influence modern technology and user experience design, and Jeff's ideas remain relevant in an era of rapidly evolving information technology.

The same action can be both conscious and unconscious, which largely depends on a person's previous experience. For example, a novice designer will spend a long time learning and mastering color correction settings in Lightroom, while an experienced specialist will perform the necessary actions intuitively and quickly, relying on their skills. This process illustrates how the accumulation of knowledge and practice influences the approach to tasks in design and other creative fields.

Jeff emphasizes the importance of locus of attention. If someone tells you, "Don't think about the white elephant," you won't be able to get rid of this thought on your own—the white elephant will become the center of your attention. This demonstrates how difficult it is to ignore what is being said and how our perception can be directed toward specific images or ideas. Learning to manage your locus of attention can contribute to more effective thinking and decision-making.

Locus of attention and cognitive mechanisms play a key role in the formation of habits in users. When people perform the same actions daily, these tasks become automatic and are perceived unconsciously. The habit process is based on repetition, which allows the brain to optimize effort by reducing conscious control. This leads to more effective task completion and the reinforcement of new habits. Understanding this process can help develop strategies aimed at creating positive changes in user behavior and improving their overall quality of life.

An observer once noted that a baseball player should focus on his technique when hitting. Baseball star Yogi Berra, continuing Lewis's thought, responded succinctly: "How can you think and hit at the same time?" This phrase emphasizes the importance of intuitive thinking in sports. Athletes often achieve success by relying on their skills and instincts, which allows them to react instantly to changing situations on the field. Thus, effective play requires not only technical mastery but also the ability to act without unnecessary thought.

Jef Raskin is a prominent American computer scientist and designer, known for his significant contributions to the development of user interfaces and software. Born in 1939, he is best known for his work on the Apple Macintosh project, which changed the way people interact with computers. Raskin was one of the first to propose ideas for graphical interfaces and the use of the mouse, which made computers more accessible to a wider audience. His design philosophy was based on intuitiveness and ease of use, which greatly influenced the subsequent development of technology. During his career, he also worked on educational projects and actively advocated for open software standards. Jef Raskin continues to be an important figure in the field of computer technology and design, inspiring a new generation of developers to create innovative solutions.

A designer must take into account the peculiarities of the human mind when creating interfaces. This allows for the formation of habits that simplify the work process. As a result, the user's locus of attention shifts from the tool to the task. Hands perform actions automatically, and attention is focused on the end result. Thus, a properly designed interface promotes more effective interaction and increases productivity.

To better understand the differences between unconscious and conscious human actions, please refer to the following table. It will help you remember the main characteristics and examples of such actions. Understanding these aspects is important for analyzing human behavior and decision-making. Using this information, you can gain a deeper understanding of how people interact with the world around them and the mechanisms underlying their actions.

Intuitiveness and Naturalness

Raskin avoided using the terms "intuitive" and "natural" in the context of interface usability. He believed that the concept of intuitiveness is only possible if the user has already had experience interacting with similar tasks and can rely on their life experience when working with the application.

When users describe an interface as intuitive, they mean that its functionality and interaction are similar to those methods or programs with which they are already familiar. In some cases, this word is perceived as synonymous with the concept of "familiar", for example, in the context: "Over time, using these editors becomes more intuitive." An intuitive interface facilitates the learning process and improves the user experience, allowing users to quickly adapt and effectively use the functionality.

Jef Raskin is a renowned American computer scientist and designer who made significant contributions to the development of user interface and graphic technologies. He is best known as the creator of the Macintosh concept, which significantly influenced the design of personal computers. Raskin was also involved in software development and was actively involved in research in the field of human-computer interaction. His ideas on visual interfaces and software usability continue to influence modern technology and user interface design. Jef Raskin's work remains an important reference point for developers and designers seeking to create intuitive and effective user experiences. The iPhone Wallet app's interface is intuitive, with all credit and debit cards organized similarly to a traditional wallet. Users can easily relate to this metaphor, allowing them to quickly understand the app's functionality and capabilities. The Wallet app simplifies financial management by providing convenient access to cards and transactions, making it an integral part of today's digital lives.

The Wallet app on the iPhone. The wallet metaphor makes it easier for users to understand how it works. Image: Apple's official website

Before the release of the first Macintosh model, the computer mouse was still a novelty, and many users did not immediately master its use. To demonstrate this, Jeff decided to conduct an experiment, inviting a group of experienced computer users who had never used a mouse before. One participant simply picked up the mouse and removed it from the table, confirming the difficulty of perceiving this device for inexperienced users.

In experiments with participants unfamiliar with a computer mouse, I simply placed it on the table, demonstrated the movement, and clicked on the object. Within 5-10 seconds, each person was able to master basic mouse skills. This process was quick and simple, but this does not mean that using a mouse is intuitive or natural. Despite the speed of acquisition, it is important to note that users need time to get used to the interface and functionality of the device.

Jeff Raskin is a prominent American computer scientist known for his innovations in the field of human-computer interaction. He was born on March 9, 1939 and was an early proponent of the graphical user interface. Raskin is best known for his work on the Apple Macintosh, which revolutionized the computing industry.

Throughout his career, Jeff focused on creating intuitive interfaces, making technology more accessible to a wider audience. He developed the concept of the "human interface," which formed the basis for many modern operating systems. Raskin's work made a significant contribution to the development of user experience design, and his ideas continue to influence technology today.

Jeff Raskin was also the author of a number of books and articles sharing his views on the future of computing and its impact on society. His legacy lives on in every modern device we use, underscoring the importance of his contribution to the development of information technology.

Raskin expresses dissatisfaction with the use of pictograms. These icons were designed to make it easier for users who do not know the system language to interact with the computer. However, in practice, when you hover over each unlabeled icon, an explanation appears about its function and the action that will occur when you click it. This can cause confusion and reduce the usability of the interface.

When you hover over an icon, a pop-up window with its description appears. Users encountering such interface elements for the first time often ask, "Why not use text instead of icons?" This is a completely logical question. At first glance, it seems that text descriptions would be clearer. However, icons play an important role in the design and functionality of the interface. They save space, make the interface more visually appealing, and facilitate the rapid perception of information. But at the same time, to use icons effectively, it is necessary to provide short explanations to avoid misunderstandings.

Jef Raskin was a prominent American computer scientist and designer, known for his work in the field of computer science and human-computer interaction. He pioneered the development of the graphical user interface and played a key role in the creation of the first Macintosh computers at Apple. Raskin developed the concept of the "human interface", which made computers more accessible and usable for a wide audience. His ideas on information organization and visual representation had a significant influence on the development of modern operating systems. Jef Raskin was also active in educational projects aimed at popularizing computer science and technology. His legacy continues to inspire a new generation of developers and designers.

This icon was located on the back of an old Apple computer. Of the 1,000 respondents, only ten people were able to correctly answer what it means.

A mysterious icon on an Apple computer. Try to guess what it means - the answer awaits you at the end of the article. Image: D. Raskin / "Interface. New Directions in Computer System Design" / "Symbol-Plus", 2007

Raskin recommends using icons only in cases where they are truly useful. For example, on a smartphone's home screen, it is much easier to find applications by icons, since the names can merge into a homogeneous array of text. Using icons makes searching easier and improves the user experience, especially in conditions of limited screen space. Correct use of visual elements can significantly improve the efficiency of user interaction with the device.

Modes

Even an experienced user can encounter errors if a small switch on the screen is not in the correct position. This often occurs due to unclear wording of the text on the buttons, which can lead to significant misunderstandings. Proper design of interface elements and clear labels on the buttons are crucial for user experience. Incorrect wording can cause confusion and negatively impact the overall user experience. Therefore, it is important to pay attention not only to design but also to the clarity of copy to avoid errors and improve user experience.

I once encountered an interface in which a button was labeled "Lock." Upon initial contact, users perceived this button as a means of locking the data in the window. However, after clicking it, the button label changed to "Unlock," indicating that clicking it again would unlock the data. This created confusion and misunderstanding among users, highlighting the importance of intuitive interface design. Effective communication through controls can significantly improve the user experience and prevent potential errors.

Many users were surprised that the data appeared to be unlocked. The button displayed the text "Unlock," which users perceived as an indicator of the current state, as is often the case with toggles in interfaces. This created confusion: in reality, the button displayed "Locked" when data was unlocked and "Unlocked" when data was locked. Correctly interpreting the button's state is critical to user experience and understanding of the system. It is important to consider that intuitive controls can significantly improve the user experience and reduce the likelihood of errors.

Jef Raskin was a renowned American computer scientist and designer who made significant contributions to the development of user interfaces. He is best known as one of the creators of the graphical user interface (GUI) concept and the developer of the first Macintosh project at Apple. Raskin placed particular emphasis on usability and intuitiveness of software, which influenced the subsequent development of technology and interface design. His ideas about how users interact with computers contributed to the creation of more accessible and effective systems. Jef Raskin's work continues to be influential in computer technology today, where the usability and functionality of interfaces play a key role in the success of software products.

Jeff suggested changing the labels on switches from "Locked" to "Locked." This would allow the interface to clearly indicate the current state, reducing the likelihood of user errors. This approach makes interaction with the interface more intuitive and understandable.

The wording of the switch itself prompts the user which mode the interface is currently in. Thanks to this, the likelihood of error can be minimized. Screenshot: Vyacheslav Lazarev / Skillbox Media

To improve the efficiency of switches, Jeff suggests using quasi-mode. In this mode, the user physically holds down the control while simultaneously performing another action. For example, to type a capital letter on the keyboard, you must hold down the Shift key, which is an example of quasi-mode. This approach improves interaction with devices, making the process more intuitive and convenient.

Frequent use of multiple quasi-modes can lead to confusion. If, for example, you've already configured seven different quasi-modes with unique hotkey combinations, the eighth combination, Control + Alt + Shift + Esc + Q, will become too difficult to remember. This can negatively impact productivity and usability. The optimal approach is to sensibly limit the number of quasi-modes and choose simpler, more intuitive keyboard shortcuts.

In the mid-1990s, Microsoft recommended that developers give users the ability to create their own modes and customize the interface. This allowed users to independently shape the interface and manage controls. While many developers view such features as a significant advantage, Jeff considered them redundant and confusing.

One Microsoft Word user compared customizing her preferences to setting a time bomb. She needed to create a list in a format different from her usual one. To do this, she studied the help information about the necessary changes and selected the appropriate settings. However, the next time she tried to create a list using the familiar "List" command, she got the format she had previously set, not the one she was accustomed to. It took her over an hour to fix the errors. This situation highlights the importance of being careful with your settings in Microsoft Word, as incorrect changes can result in significant time-consuming corrections.

Jef Raskin was a renowned American engineer and designer who had a significant impact on the development of the computer industry. He is renowned for his work on graphical interfaces and user experience concepts. Raskin developed ideas that formed the foundation of modern computer systems, making them more accessible and user-friendly. His contributions to interface design and computer interaction became fundamental for future generations of developers. Jef Raskin not only created innovative technologies but also actively shared his knowledge and experience, influencing the education and development of new IT professionals.

Documentation often lacks descriptions of user settings. This forces users to first learn how the program works in its default mode, and then delve into the settings to create customized modes.

If the user is able to significantly improve the interface's functionality with just a few simple changes, this indicates that we have not achieved the required level of quality in our work.

Jef Raskin was a prominent American computer scientist and designer known for his significant contributions to the development of computer technology. He is best known as one of the creators of the graphical user interface and the Macintosh concept at Apple. Raskin developed ideas that formed the basis for the usability of computers, making them more accessible to a wider audience. His work has had a significant impact on how we interact with technology today. Raskin was also active in issues of human interaction with computers and advanced ideas on how to make technology more intuitive. Jef Raskin's contributions to technology continue to inspire a new generation of developers and designers.

Navigation

Raskin argued that navigation in modern operating systems resembles a maze. The classic File menu often forces users to pause before selecting the desired item. Finding old files becomes a real challenge, especially if the document was opened a year ago. In this regard, Jef compares modern systems to confusing labyrinths, which highlights the complexity and usability of interfaces.

Long sequences of turns are difficult to remember, which makes mazes fascinating puzzles. This problem is relevant not only in the context of games, but also in modern navigation systems used on computers and the Internet. Often, such schemes are confusing to users, making it difficult to navigate and find the necessary information. Creating user-friendly and intuitive navigation interfaces is key to improving the user experience in the digital environment.

Jeff Raskin was a prominent American engineer and designer who made significant contributions to the development of computer technology. He is best known as one of the creators of the graphical user interface and the founder of the Apple Macintosh project. Raskin understood the importance of usability and intuitive design, which became the basis for many modern operating systems. His ideas on human-computer interaction continue to influence the development of software and technology. Raskin left a significant legacy in the field of computer science, inspiring new generations of engineers and designers. His work demonstrates how a competent design approach can improve the user experience and increase the efficiency of working with technology.

Raskin believed that the optimal approach to creating navigation in a system is to use ZoomWorld, or a scalable environment. In this system, the user is given access to all files simultaneously. To find the necessary information, it is enough to move closer to the canvas or, conversely, further away from it. This approach simplifies the navigation process and makes it intuitive, which contributes to the efficiency of working with data. A scalable environment allows users to easily navigate large volumes of information and quickly find the resources they need.

To fully appreciate the area of ​​a scalable environment, it is useful to imagine flying above it. However, to examine a specific element, you need to descend below. A scalable environment also includes a content search mechanism that facilitates navigation. The essence of this metaphor is that you can be at a certain "height," zooming in (upward) and zooming out (downward). Thus, navigation in the system is accomplished both by changing height and through search functionality. This allows users to effectively interact with large volumes of information, finding the elements they need and optimizing the workflow in a scalable environment.

Jeff Raskin is a renowned American computer scientist and designer who made significant contributions to the development of user interfaces and software. He is best known as the author of the concept of the "interactive computer" and the developer of the first graphical user interface for computers. While at Apple, Raskin played a key role in the creation of the Macintosh, which changed the way people interact with computers. His ideas about simplicity and intuitive interfaces continue to influence modern technology. Jef Raskin also actively shared his knowledge and experience, teaching the next generation of computer scientists.

The Figma layout is a prime example of effective interaction with visual content. Such a layout can contain numerous images and pre-made frames, which at first glance appears chaotic. However, thanks to spatial memory, users can quickly navigate and find the elements they need. This underscores the importance of organizing visual content for increased productivity and efficiency in Figma. Proper structure and ordering of elements contribute to easier perception of information and speed up the design process.

Image: Vyacheslav Lazarev / Skillbox Media

In the book, Jeff discusses interface design for the intensive care unit. The main screen presents the user with a visualization of the layout of the wards. When a specific room is selected, patient information is displayed, including their name and test results. This approach helps medical staff quickly navigate the situation and make informed decisions, which is extremely important in intensive care. An effective interface not only simplifies work but also improves the quality of medical care.

Image: D. Raskin / "Interface. New Directions in Computer System Design" / "Symbol-Plus", 2007

This solution automated database management, which significantly simplified the navigation process for doctors in the hospital. According to Raskin, the interface was intuitive and easy to learn, which allowed all staff, including nurses, to quickly adapt to new technologies. This improvement increased work efficiency and the quality of patient care.

Bonus. Answer to the Pictogram Riddle

Jeff Raskin shares his thoughts. He emphasizes the importance of user experience in technology development. In his opinion, interfaces should be intuitive and user-friendly. Raskin also emphasizes that technology should make life easier, not more difficult. The idea that design should be human-centered, not technology-focused, is often found in his works. This creates a more harmonious interaction between the user and the device, which ultimately leads to better results. It is important to remember that every interface element should serve the user's goals and help them achieve their tasks with minimal effort.

This icon symbolizes a trace on the oscilloscope screen. An oscilloscope is an important tool used in electrical engineering for visualizing electrical parameters such as voltage. A dashed line on the screen indicates zero voltage, while a solid line shows what the trace on the oscilloscope screen will look like when an alternating voltage is applied from the power source. Oscilloscopes play a key role in the analysis and diagnostics of electrical circuits, allowing specialists to accurately evaluate the behavior of electrical signals and identify possible faults.

Jeff Raskin is a renowned American scientist and engineer who made significant contributions to the development of computer technology. He is best known for his work on the user interface and the concept of visual programming. Raskin is also the author of several books, including "Building Computers That Work." His ideas about accessibility and usability of computers became the basis for many modern technologies and applications. Jef Raskin's contribution to computer science cannot be overstated, and his work continues to influence software and interface design.

Image: D. Raskin / "Interface. New Directions in Computer Systems Design" / "Symbol-Plus", 2007

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