Considerations in grounding and shielding by Macatee S.R.

By Macatee S.R.

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Confusion is unlikely, and the user is aware of the available options. For one-of-many choices, radio buttons are already the standard, and there is rarely reason to use other mechanisms. Use radio buttons rather than toggles; toggles work reliably only when the value of the state controlled by the toggle is your locus of attention and is visible, or is in short-term memory. 32 33 Except when the state is the locus of attention and it is usually not toggles will at times cause users errors. The kinds of errors caused by toggles are usually transient, and recovery is easy, but this is no reason to overlook them in interface design.

The limit for the number of effective quasimodes is probably between four and seven. But one quasimode can solve a multitude of varied problems (see Section 5-4). A typical problem that is readily solved by the use of quasimodes occurs when an interface presents you with a set of choices, such as the Macintosh's pull-down menus. In this application of quasimodes, you press and hold down the graphical input device button when, on the name of the menu, the other choices appear for as long as you are holding down the button.

It is up to the designer of an interface to make every feature of a product visible. [7] This book, The Psychology of Everyday Things, is not to be missed. In designing to accommodate visibility, each function and the method of operating it would be apparent to most people in the culture for which it is intended by merely looking at it. A control that has this attribute has come to be called an affordance (Norman 1998, p. 123). "Affordances provide strong clues to the operations of things.... Knobs are for turning.

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