The Essentials of Modern Software Engineering. Ivar Jacobson

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Figure 5.7 The Write Code activity card.

      An activity is always bound to a specific practice and cannot “float around” among the practices. If you find an activity that needs to be reused by many practices, then you may want to create a separate practice including this activity. The alternative is that you decide not to reuse it, but each practice that potentially could have reused it will have to keep its own copy of that activity. Changes to one copy of it will not impact the other copies; they will just change independently of one another, which means no reuse.

5.5 Essentializing Practices