Which of the following is not a main source of documented information needed to undertake a formal review once Implementation has taken place?

The choice relating to stakeholder analysis is correct because it typically serves a different purpose than the primary sources of documented information needed for a formal review after implementation.

The business case is essential as it outlines the rationale for the project, including objectives, expected benefits, and the initial investment required. Previous similar reviews provide valuable insights and lessons learned that can influence the assessment of the current implementation's success. A summary of costs and benefits captures the financial and qualitative performance indicators that are crucial for determining whether the project has met its goals post-implementation.

In contrast, stakeholder analysis focuses primarily on identifying and understanding the interests and influence of individuals or groups involved or impacted by the project. Although important throughout the project lifecycle, stakeholder analysis does not serve as a direct source of documented information for the formal review process; rather, it supports ongoing communication and engagement strategies. As such, it is not categorized as a main source for this specific purpose.