Require and Validate User Input

While a user navigates the tasklets of an application, the user must sometimes provide input to a tasklet before navigating to another. On the user interface, this means that a soft key or menu item for the action is inactive until the user makes a selection or enters data on the tasklet. User input is typically required in wizards, where information from one step is needed to complete the next step.

In addition to requiring input from the user, you want to ensure that the input is valid before the user moves on. For example, when a user creates a new customer, the application must check that the customer name provided by the user does not already exist in the customer database.

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