This booklet was designed to provide inservice teachers with a self-contained manual for use in writing and/or improving classroom achievement tests. Following a preface and an introduction, the contents are divided into four sections: Practicality, preface and an introduction, the contents are divided into four sections: Practicality, Interpretability, Validity, and Reliability. The section on reliability contains a discussion of the technique of item analysis. Two appendices (Sample Item File Sheet, Sample Item Analysis Data) are also included. (Author/PEB)