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Users need to pick a value out of a small set of predefined values.


This pattern can be applied to any context which requires selecting one out of several items.


In general, we do not recommend using dropdowns for touch-based applications in safety-related environments due to the following reasons:

Therefore, this control should be used with caution and only if:


The proposed dropdown corresponds to the standard dropdown controls used in current operating systems. However, we discourage use of combo boxes allowing text entry for touch-based interfaces.

Safety Impact

Using dropdowns to save space may free up screen real estate for other safety-relevant functions and, thus, contribute to safe operation.

Usability Impact

Efficiency in terms of reducing screen clutter.

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