The business analyst (BA) should have analyzed the completeness of the use case scenarios to avoid the situation of missing important pieces of information in the system. According to the BABOK Guide, completeness is "the degree to which a set of requirements contains all the information necessary to achieve the business objectives" 3. By analyzing the completeness of the use case scenarios, the BA can ensure that they cover all the possible paths, exceptions, preconditions, postconditions, and data elements of the system. Performing decision analysis, identifying assumptions, and preparing activity diagrams are useful techniques, but they do not directly address the issue of completeness. Reference: 3: BABOK Guide, Version 3, Section 8.2 Analyze Current State