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Affordance
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Affordance means the degree to which a control reveals its purpose to the user. A button control should look like something that can be pressed, and when you press it it should behave like it has been pressed. Scroll bars have defined handles that leave you in no doubt that you can grab and move them, and their behavior when you do should fit the expected action. A well-designed user interface has controls that spell out for the user exactly how they should be used. The other factor to bear in mind in designing controls with good affordance is that they should invite and reward exploration. A slider control should look and behave like one, and give clear feedback about the consequences of changing its setting.
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AFFORDANCE IN THE REAL WORLD DOOR HANDLES
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Think for a moment about a common real-world object such as a door handle. As you walk up to a door you will often see a handle on one side of the door and a push-plate on the other. That is great affordance. The door tells you which handle you should pull and which you should push. Now, how often have you seen a glass door that has a pull handle on both sides Watch people using that door, and you will often see them pull when they should be pushing. That s bad affordance.
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Mental Model
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A mental model is the construction that your user builds in his mind to describe and predict how your software works. For example, a word-processing system provides a mental model to the user of a space in which to create nicely formatted text content, perhaps with pictures. A word processor that didn t support a readily identifiable model would be more difficult to learn, since the user would have no familiar frame of reference in which to approach the program. The mental model that you would be trying to support in writing a word processor would be one involving the creation of a new document (a blank sheet of paper in the real world), tools to put text and images down on the page (a pen or even a typewriter, with a pastepot to glue in a picture), tools to construct the document (more pages when you need them), and some mechanism to store it at the end of the process (folders in a filing system).
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CHAPTER 14: Usability and Accessibility
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An appropriate mental model can be difficult to define, as many factors may influence the user s mental model of your system. Still, it s worth the effort. A well-designed system makes no assumptions about the user s prior knowledge, but provides the appropriate visual scaffolding and other cues that steer the user toward the mental model that you intend for the system. There should ideally be just one mental model a poorly thought-out system design may allow your user to choose from a variety of mental models, which is a sure recipe for confusion. It is worth taking the time to consider the model that you intend and to provide all of the cues that you can to support that model.
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Usability Considerations for Mac OS X
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It would be easy just to say Read the Human Interface Guidelines. After all, Apple has gone to enormous trouble to make sure that developers understand the purpose of every element in application design. And the guidelines are well worth reading (just search for Human Interface Guidelines in the Developer Documentation). At around 400 pages (plus another 130 or so for the iPhone HI document) they are a big read, though, and so this section is an introductory overview just enough usability to get you started. Writing your applications using Xcode and Cocoa frameworks such as AppKit and UIKit help hugely in building consistency and affordance into your applications. Let s look at some general usability considerations in designing programs (most of these are as true for development in any other computer system) and then some of the tools provided in Interface Builder to aid usability.
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