What type of review is not based on a formal documented procedure?

An informal review is characterized by its lack of a structured process or formal documentation requirements. This type of review typically relies on direct communication among team members or stakeholders to discuss and address issues with a product, artifact, or requirement. It happens in a more casual environment, often without scheduled meetings or predefined criteria for evaluation.

In contrast, the other types of reviews, such as technical reviews, formal reviews, and systematic reviews, involve established guidelines, roles, and procedures to follow. Technical reviews may include specific technical aspects and often require documentation to outline the objectives and outcomes. Formal reviews focus heavily on compliance with predetermined criteria and are well-documented to ensure traceability and accountability. Systematic reviews follow a structured approach to evaluate the material critically using objective criteria.

Understanding the difference between these types of reviews is essential, particularly in Agile environments where flexibility and rapid feedback are emphasized. The informal review serves as a quick, lightweight way to address issues without the overhead of formal processes, which can be beneficial in fast-paced projects.