This text, a revision and extension of the first three editions, consists of papers discussing the basic considerations in sampling air for specific purposes, sampler calibration, systems components, sample collectors, and descriptions of air-sampling instruments. (BT)

Criterion-referenced testing (CRT) is defined as a method of ascertaining an individual's status with respect to some performance standard. Computer-assisted testing (CAT) is a method of constructing tests using a variety of computer techniques such as a single test computer printouts, stored item banks, teacher specified criteria, machine…