The Efficient Course of Action in "Trouble Shooting" as a Joint Function of Probability and Cost

most acceptable criterion is one which is generated by an appropriate general model of the behavior requirements of the situations within which persons must work. This is the general problem to which this study is addressed. This study has the following purposes: (a) to present a probabilistic model of &dquo;trouble shooting&dquo;; (b) to utilize available maintenance records for several aircraft power plants to determine whether the assumptions of the model are generally justified; (c) to propose two methods for combining the probability and time estimates for various repairs associated with a set of symp-