So ware is developed to be used for many years. However, it needs modifi cations from time to time to
meet the changing requirements of users brought about by continual changes in organization systems
and its environment. Minor modifi cation or customization of so ware is called so ware maintenance.
e so ware personnel sometimes spend more than 50% of their time on maintenance activities. Some-
times the cost of maintenance exceeds the cost of the so ware. Hence, maintainability is an important
quality parameter of so ware. Maintainability can be defi ned as ease with which the so ware permits
itself to ...
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