#Jef raskin book software#
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For example, in the middle of writing a text document, a user should be able to do a mathematical computation by writing out the computation in the document, then hitting some 'calculate' function.

#Jef raskin book software#

An end to stand-alone applications – every software package should be structured as a set of tools available to users on any document.Raskin also advocates a document-centered approach to computer interfaces that entails several radical changes to the current nature of operating systems and software: A modeless interface, monotony of design and elimination of blocking warnings are all intended to favor habit-forming reactions to interface handling.

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Habituation is an important concept driving Raskin's guidelines, intended to free the user's mind from attention to low-level interaction details.

Universal use of text – Raskin argues that graphic icons in software without any accompanying text are often cryptic to users.

Elimination of warning screens – modern software applications often ask the user 'are you sure?' before some potentially harmful action Raskin argues they are unhelpful because users tend to ignore them out of habit, and that having a universal undo eliminates the need for them.

Universal undo/redo – every action should be undoable and redoable, even after a document or application has been closed and reopened.Monotony of design – there should be only one way to accomplish a certain atomic task in an application (in many modern applications, there are at least three - one through a button on the screen, one through a menu dropdown, and one through a keyboard shortcut – and often more).

Raskin advocates either getting rid of them entirely or using ' quasimodes' (a term he invented in the book) a quasimode is a state in which the user must make some constant physical action in order to keep the computer in that state, so that they cannot forget that they are in that mode an example is the keyboard's shift key. Modelessness – a mode is a state in which the computer produces a different output for the same input than it would have if it were another state the classic example is the keyboard's ' caps lock' key.Raskin also advocates a number of changes to conventional interface design. All are intended to minimize the amount of time required for the user to perform any specific task. Raskin includes a chapter demonstrating four models of quantifying the efficiency of a software interface: the GOMS keystroke model, Raskin's own efficiency measure, Fitts' law and Hick's law. Many of the ideas presented in the Canon Cat and The Humane Interface were later adopted by Raskin in his Archy project, and later by his son Aza. The Canon Cat is often considered the first information appliance.

Raskin often refers to the computer he designed, the Canon Cat, as an example of a system that implemented the various measures he advocates. The overriding theme is that current computer interfaces are often poor and set up users to fail, as a result of poor planning (or lack of planning) by programmers and a lack of understanding of how people actually use software. The book puts forward a large number of interface design suggestions, from fairly trivial ones to radical ones. It covers ergonomics, quantification, evaluation, and navigation. The Humane Interface: New Directions for Designing Interactive Systems ( ISBN 7-6) is a book about user interface design written by Jef Raskin and published in 2000.