In which part of the ADM cycle do building block gaps become associated with work...

 In Phase E of the ADM cycle, building block gaps become associated with work packages that will address the gaps. This phase involves creating an Implementation and Migration Plan that defines a set of work packages and Transition Architectures that will deliver the Target Architecture. Reference: The TOGAF® Standard | The Open Group Website, Section 3.2.5 Phase E: Opportunities & Solutions.