This paper provides guidelines for improving the objectivity, quality, and relevance of classroom observations. Suggestions are organized according to the three stages of the observation process--prior, during, and after the observation. Tips for establishing and maintaining a positive climate and for necessary preparations prior to the observation are grouped into four areas: scheduling; preparing the observer; preparing the teacher; and preparing the students. During the observation, the following practices will increase the quantity and quality of data: attending to classroom activities; recording information; and collecting objective information. After the observation, it is important to complete the documentation and follow up with the teacher. Other recommendations include holding several formal and informal teacher evaluations throughout the year, utilizing multiple information sources, and retaining all documentation. Two tables and two figures are included. (LMI)