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Solution

Provide hints about what kind of text input you expect from your customers. You can do this by providing fields showing formatting, by providing sample values in the fields, or by providing explanatory text. Whenever it is simple to do so, allow flexible formatting and have the computer determine the correct format. Also make clear which fields are required and which are optional so that customers will not have to guess.

Figure K12.7. Prevent errors by providing sample formatting and differentiating between required fields and optional fields.



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