It depends on your business
requirements and how you are going to design the system. Basically the decision regarding Abstract class and related aspects will decided on the detailed design phase
of the project..
Tom
Adding one more point, in almost all
projects, the Project Leader/Architect will design the initial project framework before he dive the project to his team members. In most the cases this is the
best time to decide about all the abstract classes and its associated methods..
Tom
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