G103 – Provide only one open window e.g. pop up or multiple overlapping windows should be avoided.

Standard

Guideline:

Provide only one open window e.g. pop up or multiple overlapping windows should be avoided.

Guideline Description:

The use of a single window eases the interaction. The use of multiple overlapping windows hampers the interaction, so this technique should be avoid.

Example:

example guideline g103A good example with single window, and example of windows overlapping that should be avoid.

Source:

Designing touch-based interfaces for the elderly,2010

Tags:

Content, Elderly, Layout, Overlap, Screen, Windows

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G98 – Interfaces should avoid placing the secondary target outside of a 100mm radius from the primary target, unless anchoring with thumb.

Standard

Guideline:

Interfaces should avoid placing the secondary target outside of a 100mm radius from the primary target, unless anchoring with thumb.

Guideline Description:

In the multi-target selection, in the case of the selection of the primary target with  the index finger (index-anchored) the secondary target should  be avoid placing outside of a 100mm radius, for a correct  selection of the menu items. When is used the selection of primary target with the thumb (thumb-anchored) this value can be slightly increased.

Example:

Example G98

Example of a menu index-anchored with secondary target placed inside of 100mm radius and selectable areas.

Illustration adapted from Design of Unimanual Multi-Finger Pie Menu Interaction

Source:

Design of Unimanual Multi-Finger Pie Menu Interaction,2011

Tags:

Interaction, Layout, Multi-target selection, Multi-Touch, Overlap.

G42 – It is necessary that interface elements do not are covered by fingers, hands or arms during the interaction.

Standard

Guideline:

It is necessary that interface elements do not are covered by fingers, hands or arms during the interaction.

Guideline Description:

The partial occlusion of the screen caused by fingers, hands and arms when users interacting with surface are an aspect that should be into account in the design of a multi-touch interface. So, the design of interface should avoid occlusions that affecting the interaction, and the hand and arm movements should be considered in the placing the elements in the user interface, in order to prevent early muscle fatigue.

Example:

example_guideline42

Examples of finger occluding pie menu.

Source:

Challenges for Designing the User Experience of  Multi-touch Interfaces, 2010

Tags:

Challenge, Interface, Interaction, Layout, Motor, Multi-touch,  Overlap.

G3 – Do not overload the same object with actions performed by a tap and by a drag gesture.

Standard

Guideline:

Do not overload the same object with actions performed by a tap and by a drag gesture.

Guideline Description:

The same object should not be overlapping with actions performed by a tap and by a drag gesture. In case of insufficient pressure or of false starts these two gestures may be easily confused.

Example:

example_g3

Example of an object with overload of tap gesture and drag gesture.

Source:

An Exploratory Study of a Touch-Based Gestural Interface for Elderly,2010

Tags:

Accessibility, Content, Elderly, Gestures, Interaction,  Layout, Multi-touch, Overlap