Which review involves a less formal process, lacking documented procedures?

The review that involves a less formal process, lacking documented procedures, is the informal review. This type of review is characterized by its spontaneous nature and the absence of structured guidelines or formal documentation. Informal reviews often occur in collaborative settings, where team members provide feedback and observations in a conversational manner rather than through a structured meeting.

In contrast, technical reviews are more formalized and often involve a clear process of evaluation against predefined criteria. Peer reviews follow similarly defined protocols, where specific roles might be assigned to participants to ensure a comprehensive evaluation. Quality reviews aim to assess the compliance of products with established quality standards and typically include documented procedures to ensure consistency and thoroughness.

Thus, the informal review stands out due to its relaxed approach and lack of formal structure, making it the correct choice in this context.