Which of the following review types is least formal?

Walkthroughs are characterized by their informal nature compared to other review types. In a walkthrough, the author of the document or product leads stakeholders through the material in a more conversational manner, often encouraging interaction and immediate feedback. This process fosters collaboration among team members and is focused on understanding and sharing information rather than adhering to rigorous standards or protocols.

On the other hand, other review types typically have stricter guidelines and processes. Audits often involve thorough and systematic evaluations to ensure compliance or quality standards, inspections focus on identifying defects or issues in a structured manner, and technical reviews are conducted with specific focus on technical accuracy and quality, usually involving experts in the subject matter. Thus, while walkthroughs aim for engagement and clarity through open discussion, the other types of reviews involve more formal and structured approaches.