In the paper, we discuss a way to improve the teaching quality with the resource-based approach. The solution includes a model of teaching quality, a method of student-centered teaching, and means for analyzing and managing the unobservable quality characteristics. We propose to consider the education process as a system with negative feedback, where the deviation of the values of the educational process characteristics from the normal ones diagnoses the type of problem that violates the normal state of the educational process. The formalization of the unobservable quality characteristics of the educational process is carried out. The means for measuring the values of these characteristics on different scales are considered, and examples of their use are given. As well, we provide a formalized description of the teaching process and a set of questions for student evaluation of teaching. An algorithm for the creation of a questionnaire, which covers the characteristics of various components of the teaching process, has been developed. Finally, we describe the task of informational diagnostic for student evaluation results and the catalog of teaching tactics as the means for systematically forming quality improvement activities.