The first step in interface system definition is basically an extension of the first external system step from the previous chapter, i.e., defining information needs.  Since in this step the analyst focuses the requirements process on the interface system, however, (s)he organizes the information according to data content type, identifying the audience of the data, defining output schedules, and even defining response-time requirements. 

The Art of Delivering Interface Requirements Part One, Fifth Edition

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Copyright © June 26, 2019 Raymond L. Newkirk