This is my first published book: in December 1989; it was presented into the windows of the books-shops in Bucharest just on the days of the Romanian Revolution December 16-22, 1989, at the collapse of the communist regime. A new edition was launched just on the first days of the January 1990, under the diligence of the publisher (erasing the preface and three bibliographical items - items related to three now ex-personalities, also making a new editorial entry/pagination). Within the irony of the fate, other three bibliographical items were before erased during the editorial checking alongside the 1989 year - these items were related to three emmigrated/escaping personalities during Ceausescu regime. The entire book is dedicated to the theoretical approach and the praxis of the complex (quasi-chaotic) problems to be solved under constrains; the short temporal period is the defining constrained pattern of an operative problem. The book is constructed on the background/alonside my personal experience within military operative problems, and energy crisis operative problems - extending this experience within an original systemic and cybernetic approach to larger categories of operative problem (medical surgery, agriculture, transportation, commerce, business, and general decisional tension within managerial processes. [Measurement of the recordable patterns of the human neurological diseases using psychophysical techniques, and the adaptive and interactive proceeding, till the recovering of an experiential / experiencial / analytic / holistic neuro-therapy may be an operative problem, sometime.] My first book is an original contribution within Decision Science - openning the realm of Operative Problem Solving (resolving the problem within -at least- proper methods, and not at all disolving the problem). The book takes the conceptual inspiration from the important background of Artificial Intelligence domain - where the representation and the solvation of a problem are sequential but different tasks. The book adds an other sequence and differential tasks: the pre-internalization of a problem, then the internalization of a problem, the representation and the solvation of a problem - attaing the operative decision making - but, then, (re)adapting the entire function/functionality of the system inside which the operative problem was constituited or was constitutiong, then (re)adapting the entire structure of the system with the operative problems - and at an end - (re)adapting the conceptual architecture of the category of the respective systems. All being circular - as the proposed cycle: information1 - decision - action - information2 / alongside all the above described processes. The book has five parts: 1_Contextual approach of the operative problems (linguistic, systemic, cybernetic, philosophical, general human, managerial); 2_Development versus complexity; 3_Becoming of a definition for the operative problem; 4_Resolutive models; 5_Open problems and open concepts. Regarding the search for definitions, models and real problem frames, there were useful some original constructs (developed till the impact with corresponding mental concepts – as step inward System Engineering): • magellanity (the individual and/or collective stage to have a long-term iterative confidence into the problem representation), • internalization (decisional skill versus hard problem representation), • reflecting the reflection (first step consciousness), • Cybernetics of the Operative Actions (practical collection of rules for the operative decision makers), • Cybernetics of the New Products (practical collection of rules and cases for the operative decision makers into the productive / competitive area), • equivalent state number (beyond probability classical frame), • mixed system (stationary preservation of human and technical resources), • minimal security zone (within solving a conflict), • development rank (quantization of the humankind development trend), • (awareness) knowledge subspace, (meta-knowledge) consciousness subspace, (toward objectives) action subspace, responsibility subspace (subspaces for an analytical model of the operative decision making), • heuristic determinism (other than probabilistic determinism and causal-dynamic determinism), • concept-construct duality (human mental efforts to decline the unknown terms within mental embedded patterns – innate and/or obtained till the magellanity threshold), • analysis/synthesis dual flow (regarding representation and solving of an operative problem), • structure/functionality sections into a systemic entity (the basic approach into the book), rational subject (delimitated entity in front of complex constituted problems), entity/system appearance and reality (an insight into the complex amalgamation of the properties: synergy, neg_entropy, ephemerality = to do more and more with less and less), • triad: (hypothetical) reality, model, ideal, • triad (production, intelligence, moral), • operative teams – operative problems (organizational response in front of the operativity), team for generating teams, eight types of teams/problems, their becoming, • identification of the problem elements [resources, objectives, criteria, criteria for criteria, procedures and linkage; (neo)kantian space-time-causality], • induced and included operativity (two varieties), • constituting and constituted frames for the problems, • general characteristics of the operativity and of the operative problems, • (resources1; teams; systems; resources2) – a new type of representing (action; reaction; their carriers), • nine moods of constituting operative problems in mixed system, • flow of the problem in mixed system, • operativity-complexity relation(s); two types of development within operative contexts, • models, methods, relations; operative examination(s) and conflict(s) cancellation(s) . The book (above presented), the examples and the open problems (included into the book) were useful (from 1990 till now) for my military students at the course Large Scale System Automatization (into military radioelectronic warfare), for my civil students at the course System Modelling and Simulation, for civil specialists (Electro-command centres), for military and civil doctorate candidates preparing their Ph.D. thesis in various domains firmly connected to Complex Problems, for general readers – in front of the contemporary complexity within all human acts, beliefs, knowledge and technology transfer