G112 – Avoid note taking or scribble functions.

Standard

Guideline:
Avoid note taking or scribble functions.

Guideline Description:

The use of note taking or scribble functions should be avoid. This technique reduces the legibility.

Example

example g112Example of an application using handwriting.

Source:

Designing touch-based interfaces for the elderly,2010

Tags:

Design, Elderly, Layout, Legibility, Multi-Touch

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G111 – Avoid some gestures in the multi-touch interaction.

Standard

Guideline:

Avoid some gestures in the multi-touch interaction

Guideline Description:

The use of some  gestures in the multi-touch interaction can be difficult to performing by the older adults, namely the most complex gestures, due to  some physical changes associated with the aging. Rotate gesture is an example of a difficult to perform gesture.

Example:

g111-example1

Elders using rotate gesture during a testing session.

Illustration adapted from Exploring the Accessibility and Appeal of Surface Computing for Older Adult Health Care Support

Source:

Designing touch-based interfaces for the elderly,2010
Exploring the Accessibility and Appeal of Surface Computing for Older Adult Health Care Support,2010
Tabletop Sharing of Digital Photographs for the Elderly,2006
Touch Panel Usability of Elderly and Children, 2014

Tags:

Accessibility, Elderly, Gestures, Interaction, Multi-touch

G99 – Interfaces should avoid placing the secondary target within 50mm of the center of the primary target for thumb-anchored selections.

Standard

Guideline:

Interfaces should avoid placing the secondary target within 50mm of the center of the primary target for thumb-anchored selections.

Guideline Description:

In the multi-target selection, in the case the selection of primary target with thumb (thumb-anchored) never places the secondary target within 50mm of the center of the primary target, for a correct selection of the menu items.

Example:

Example G99

Example of a menu thumb-anchored with secondary target placed outside of 50mm of the center of the primary target.

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.

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.

G97 – Interfaces should avoid placing the secondary target directly above the primary target for index-anchored selections, and below the primary target for thumb-anchored selections.

Standard

Guideline: Interfaces should avoid placing the secondary target directly above the primary target for index-anchored selections, and below the primary target for thumb-anchored selections.

Guideline Description:

In the multi-target selection, in the case of the primary target selection with  the index finger (index-anchored) the secondary target should  be avoid placing directly above. When is used the selection of primary target with the thumb (thumb-anchored) the secondary target should be avoid placing below. These recommendations are important due to wrist limitations.

Example:

Example G97

Examples of correct placement of menu using index finger (index-anchored), using thum (thumb-anchored) 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.

G96 – Interfaces can use either the index finger (index-anchored) or the thumb (thumb-anchored) to select the primary target; there are no performance differences.

Standard

Guideline:

Interfaces can use either the index  finger  (index-anchored)  or  the  thumb  (thumb-anchored)  to  select the  primary target;  there  are no performance differences.

Guideline Description:

In the multi-target selection, the selection of primary target can be done by the index finger (index-anchored) or by thumb (thumb-anchored). There are no performance differences.

Example:

Example G96

Examples of  use of  index  finger  (index-anchored)  and use of thumb  (thumb-anchored).

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.

G95 – Interfaces should take the trade-off between the speed and accuracy into account: Simultaneous can be faster but more error-prone while sequential is slower but less error-prone.

Standard

Guideline:

Interfaces  should  take  the  trade-off  between  the speed  and  accuracy  into  account:  simultaneous  can be  faster  but  more  error-prone  while  sequential  is slower but less error-prone.

Guideline Description:

In the multi-target selection two selection techniques can be explored, namely sequential and simultaneous techniques.

Sequential Technique uses the thumb or index finger to select the  primary  target  followed  by  another  finger  to  select secondary target (seven  finger combinations in total, thumb with index,  middle,  ring,  or  pinky;  and  index  with  middle, ring, or pinky).

Simultaneous Technique uses the  thumb  or  index  finger to select  the  primary  target  and  another   finger  to  select  secondary   target   at   the   same   time  ( also seven  finger combinations in total).

The main difference between these techniques is that simultaneous technique can be faster but more error-prone while sequential is slower but less error-prone.

Example:

Example G95

These examples illustrate the use of sequential and simultaneous technique.

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