Final answer:
Joel's focus on primarily committing household burglaries after a varied criminal past exemplifies the concept of 'specialization' in criminal activity.
Step-by-step explanation:
Joel's behavior illustrates the component of Specialization in the context of desistence in criminal activity. Specialization refers to a pattern where an individual commits fewer types of crimes but may continue to engage in a specific kind of criminal activity, such as household burglaries in Joel's case. It indicates a sort of narrowing down of criminal behavior to a specific area rather than a complete cessation of all criminal activities.