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| Main criterion/subcriteria | Description of characteristics | Assessment criteria |
|
| Comprehensibility | Use of understandable semantics
(i) Avoidance of foreign language and technical terms
(ii) Use of generally intelligible symbols and terms (on buttons)
(iii) If necessary, provision of additional explanations | 5-point Likert scale
(1 = does not apply at all;
5 = does fully apply) |
Simple comprehensibility and interpretability of displayed images and depictions
(i) Self-explanatory images and depictions, understandable without further support and explanations | 5-point Likert scale
(1 = does not apply at all;
5 = does fully apply) |
Simple, self-explanatory menu structures
(i) Easily understandable and internally consistent menu structures
(ii) Avoidance of strong hierarchical menu structures and too many functionalities | 5-point Likert scale
(1 = does not apply at all;
5 = does fully apply) |
|
| Presentation (Image and Text) | Sufficient colour contrast
(i) Clear, distinguishable colours for images and depictions or choice of colour-neutral depictions
(ii) Avoidance of excessively glaring colours | 5-point Likert scale
(1 = does not apply at all;
5 = does fully apply) |
Large size of operating elements
(i) Sufficient size of screen as well as input and output fields | 5-point Likert scale
(1 = does not apply at all;
5 = does fully apply) |
|
| Usability | Intuitive usability
(i) Ability to use the application without prior knowledge
(ii) Ease of learning
(iii) Fast achievement of a first feeling of success | 5-point Likert scale
(1 = does not apply at all;
5 = does fully apply) |
Simple recognition of click-sensitive areas
(i) Simple distinction between click-sensitive and non-click-sensitive areas, also without prior knowledge of the features of the touchscreen technology | 5-point Likert scale
(1 = does not apply at all;
5 = does fully apply) |
|
| General characteristics | High fault tolerance/efficient fault management
(i) Reducing probability of erroneous data input by limiting choice to meaningful values
(ii) Efficient proofreading mode and/or helpful user feedback, for example, in case of erroneous data input | 5-point Likert scale
(1 = does not apply at all;
5 = does fully apply) |
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