The purpose of control is not only to detect errors and defects in performance of work but also to adopt remedial measures. Without taking corrective actions, controlling has no meaning. Corrective actions are, therefore, initiated on the basis of factors causing deviations between standards and actual results. For example, actual performance may fall short of standards due to outdated machines or absence of adequate incentives to workmen. This can be rectified by installing up-to-date machinery or offering suitable incentives to workers for better performance. Thus, a corrective action may involve a change in methods, machinery, rules or procedure. Improving physical conditions of work, or changing the nature of supervision may also be necessary at times. Where the deviations cannot be rectified through managerial action, the standards may have to be revised.