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Next: Functionality requirement - part III Up: Requirements Previous: Functionality requirement - part I

Functionality requirement - part II

The system should not signal an error where no such error is present.

This part of the requirement is linked to our consideration of properties of grammar checkers related to the information retrieval property of precision. It will not be dealt with further here, except to note that it will require us to add detail to our ideas of what signalling an error means in terms of flagging a part of unproofed text. However, there will be some mention made of precision in the discussion of reportable attributes (Reportable attributes of writers' aids) and of methods (Methods), because it provides information that is necessary to make sense of the part I requirements for the customer, and because it requires a different kind of testing method.