Question: Essential ( E ) : It is a requirement that is necessary for achieving the goal of using the system. Desirable ( D ) :

Essential (E): It is a requirement that is necessary for achieving the goal of using the system.
Desirable (D): It is possible to achieve the goal of using the system effectively without a desirable requirement (in other words, not including desirable requirements/functionality is not going to influence how effectively the system works). Still, it would be good/preferable to have it implemented.

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