The document provides guidance for writing objective and learner-focused key messages after observing a teaching session. It advises that key messages should:
1) Clearly describe the aspect of learning being commented on (e.g. skills developed, progress made).
2) Use evaluative words to indicate the extent/quality of learning or progress.
3) Include evidence from the observation to support claims about learning.
4) Aim to paint a comprehensive picture of learners' experiences over time, not just in one session.