Learn in the textbookImplementation and Review
DefinitionA joint review (共同レビュー) is an activity in which stakeholders in different roles, such as developers and users, go over a work product together, check whether it meets the requirements, and reach agreement.
ExplanationWhat gets inspected is the work product of each phase, such as the requirements definition document or a design document. With the user side taking part, it becomes easier to find mismatches with the requirements that developers alone would hardly notice.
AnalogyIt is like a meeting before a house is built, where the owner and the architect spread out the plans together and check room by room that the layout is what the owner wants.