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In the framework of evaluating grammar checkers we suggest the
following specialisations of the qualitative characteristics, based on
The present study focuses on this characteristic, since this is the
one that has to do with NLP.
- the system should detect errors and specify what they are, thereby
enabling the user to correct them;
- the system should not specify non-errors;
- the system should be able to handle combinations of errors to
- the user interface should have a form that makes the system easy
and efficient to use, e.g.
- text replacement;
- marked-up copy.
This characteristic will not be tested explicitly.
- the system should not crash or loop;
- the system should always specify the same grammar error in the
same context the same way.
In addition to the characteristics proposed by ISO 9126, we
Customisability could be said to be part of functionality, but in our
opinion it is a separate characteristic.
- the system should allow the user a certain control over the
Below, we concentrate on functionality, and the attributes, measures
and methods attached to that particular quality characteristic.
Efficiency, maintainability and portability we find are
of importance to software developers and maybe certain purchasers of
systems, but not relevant to the NL focus of the present work. First,
we consider the task in more detail.