Agricultural entomologists are considerably behind their colleagues in the field of public health in determining levels of insecticide resistance among pest arthropods, this being particularly true as regards standardization of techniques. In agriculture numerous reports of resistance are received but many of these are based on repeated control failures in the field. Such reports are uncertain and only show gross difference at best. Careful laboratory procedures eliminate uncertainty and provide precise data upon extent and degree of resistance. Furthermore, if laboratory techniques are standardized Wherever possible, other workers now and in the future would have familiar, time-saving methods available for use. This is essential for comparative purposes, and also the results through standardization would provide reference points for the future, when unexposed strains cannot be found. As a consequence of these needs, test procedures are reviewed and basic suggestions for standardization are made.