Now prolongation of the appointed service life of technical devices is spent by an estimation of a technical condition лидерных or is artificial the made old samples. Such works pursue the aim — to define such service life at which physical and chemical processes of ageing yet do not worsen device technical characteristics. In the present article the original way of definition of a deadline of service of the nonrestorable technical device under the statistical data about refusals of this device in operation is offered.

 The paper introduces a concept “expanded semantic network of a tutoring system”. Also the paper discusses a number of complexity measures of this network - complexity measures for concept, shareable content object, object repository and content package