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This chapter is from the book 20.8 Order of Implementation

20.8 Order of Implementation

Classes need to be implemented (and ideally, fully unit tested) from least-coupled to most-coupled (see Figure 20.7). For example, possible first classes to implement are either Payment or ProductDescription; next are classes only dependent on the prior implementations—ProductCatalog or SalesLineItem.

Figure 20.7 Possible order of class implementation and testing.

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