Alabi and Weare (2014) define two types of peer observation. Formative evaluation is intended for "personal use," rather than public inspection, and is private and confidential. Summative evaluation is intended for public review and is often a requirement of a tenure and permanent status process (p. 181). The UMD Libraries' peer teaching observation program is formative - being observed and observing is optional, and the process remains confidential between the two parties.
Peer teaching observations are a collaborative process, in which colleagues observe each other with the intention of sharing instructional experiences. Librarians who participate in a peer observation program should approach the process with a growth mindset and be committed to both giving and receiving constructive criticism. Teaching observations are not intended to be punitive or judgmental. Instead, the process should be a positive, productive, and affirmative experience for both observers and observees.
References:
Alabi, J. & W. Weare. (2014). Peer review of teaching: Best Practices for a non-programmatic approach. Communications in Information Literacy, 8(2), 180-191.