Why it is bad? Any thing you give extra cost you, nothing is free. It will also cost you to maintain that feature after customer acceptance. Some time this extra feature can cause you more problems in later stage. On one of software development project one developer added a feature where user can export a file. The developer told that it did not cost extra as it was part of the features. Customer liked it. Later on the developer spent most of the time troubleshooting exported files. It became an headache and also nuisance. These file will have error or format problem. Now it was too late to delete this feature because customer is using it. This happens all the time in our projects. So if you thing something is being delivered extra, change the scope and incorporate this in your project plan and assign the resources to it. You may think it is free or but it will effect the three constraints cost, time and specifications.
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