The integrity of decisions, projects, programs, policies is a key factor in the success of a modern professional, company, social institutions, state, nation, world economy. Complexity is a science that combines philosophy, theory and practice of the formation and implementation of integral decisions. Knowledge of complexity allows every professional to construct holistic theories and practices for various areas of their activity. The holistic method (philosophy of the whole and the whole) and the tools for its implementation are convincingly presented - the holistic complete approach (methodology of the theory of holistic activity), the method of systemic complete technology (methodology of the practice of holistic activity). The main task of the author of the complex is to help both beginners and experienced a specialist can form his own version of holistic thinking for implementation in theory, in a project and in practice. For consultations, you can contact the author at [email protected] and on the website systemtechnology.ru