Clinical and Laboratory Standards Institute document EP10-A3-AMD—Preliminary Evaluation of Quantitative Clinical Laboratory Measurement Procedures; Approved Guideline—Third Edition is intended to facilitate a limited, preliminary evaluation of the performance of a measurement procedure or device. Using the experimental design and data analysis procedure described, determination of whether a device has problems that require further evaluation or referral to the manufacturer can be done with a minimum expenditure of time and material. Included in Appendixes A and B are sample data sheets that should facilitate the analysis of the data. Appendix C contains a more sophisticated, powerful, statistical method for determining the possible causes of imprecision.