Purpose - To show that holism, which has been the original aim of the systems theory as a worldview of holism rather than reductionism, is best attained by application of those versions of systems theory that result from synergies of mutually complementary systems theories as methodologies. Design/methodology/approach - Mulej's dialectical systems theory (DST) is applied as worldview and methodology of requisite holism using Mulej's dialectical systems concept. Finding - Two methodologies of co-operative systems thinking - the network thinking and the DST - are compatible and complementary. They can be used for development of a new systems theory. Research limitations/implications - Research is limited to making a methodology helping managers attain more holism in a new synergy of two well established systems theories. Its application is expected with managers of business organizations. Practical implication - The new concept was tried in railway management successfully. But this paper is too short to contain this application. Originality/value - Authors neither know books nor articles presenting the new "Dialectical Network Thinking'' theory nor its application except for their own unpublished texts.
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