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(۱) Evaluation of System’s Element Operation Quality. Solution for this problem allows determining elements carrying potential threat of general system operation failures and analysing their impact on surrounding elements. For systems composed of elements of the same type, solution of this problem allows for determining elements operating in the best way, that is, reference elements. Finally, development of generalized conclusions on general system operating quality is based on results of system’s elements evaluation. (2) Choice of Optimal Mode for System Operation. Solution of this problem allows for determining most “comfortable” as well as potentially failure and extreme system operating modes. (3) Evaluation of System Operation Quality. Solution of this problem allows for determining the general quality of system operation according to defined set of parameters, criteria, and operation modes. (4) Choice of Optimally Operating System out of Given Class of Equivalent Systems. Solution of this problem allows us to determine the best (referential) or the worst systems of the class. Optimally functioning elements, modes, and systems determined in the evaluation process may be used along as practically reachable quality references. (5) Analysis of System Operation History. Solution of this problem allows us to track and forecast the quality of system operation, determining trends of its development in the context of improvement or deterioration and to prevent possible failures in advance. Turning to the issue of human prosthesis analysis, results of elements operation quality evaluation allow to define MMSS joints that are exposed to overload in the course of motion and distort its kinematics. Choice of optimal mode allows us to determine the most sparing pace of motion for disabled persons. Evaluation of system operation quality may therefore be interpreted as the quality of prosthesis for specific invalid. Choice of optimal system of the class defines the best running prosthetic result possible to be used along as evaluation criterion. If the class is represented by the set “disabled person—set of prostheses of different constructions,” the choice of optimal system means determination of most favourable prosthesis construction for specific patient. Analysis of system behaviour during certain period of time allows for evaluating the process of invalid adaptation to prosthesis applied and so forth. Study of evaluation results with the presence of negative or close to negative conclusions provides strong reasons for improvement or change in rehabilitation methods applied.

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