The Goal of an Act and the Task of the Agent.- On the Essence and Goals of General Methodology (Praxiology).- An Outline of the Prehistory of Praxiology.- An Analysis of the Concept of Goal.- Comments on the Concept of Efficiency.- The Value of Perfect Information.- A Praxiological Theory of Evaluations.- Praxiosemiotics: the Theory of Optimum Message in the Service of Other Disciplines and Practical Activities.- A Formal Theory of Actions: Syntax and Semantics of Behaviour.- Praxiological Models - Praxiological Modelling of Systems of Action.- Planning and Implementation. An Elementary Primer of the Cybernetics of Planning.- Praxiology and the Theory of Programming.- Making Use of Science in Actions (A Study in Methodology and Praxiology).- Practical Problems and Practical Directives.- A Praxiological Theory of Design.- Some Problems of the General Theory of Struggle.- Struggle in a Dense Social Environment.- The Theory of Organization and Management.- The Importance of Praxiology for Political Economy.- Praxiology and Technology.- About the Contributors.- Index of Names.- Index of Subjects.