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The paper addresses the final results of a brazilian doctoral research developed at civilian Air Navigation environments (2011-2014), withpartial results already presented at past ISAPs (2011-2015). The study adopted a qualitative, systemic and anticipatory approach to increase metacognition about Team Resource Management (TRM) Training abilities, focused to Threat and Error Management (TEM) practice, with the main purpose of reinforcingoperational safety as a whole. It used Multimethodology, aiming at identifying, structuring, analyzing and monitoring problems upon participants´ different perspectives - operators and heads of distinct sectors. Multimethodology embraced four phases, yearly, coveringmultiple instrumentsand Theoretic Base, as Conceptual Map, System Thinking and Complexity. Some conclusions indicate: (i) organizational trend to reactive and bureaucratic cultures characterized by difficulties to deal with unexpected situations, not prescribed on standards, and to prioritize solutions to their possible effects that might be aggravated in the course of time; (ii)improvements of TRM behavior´s abilities - Communication, Situational Awareness, Stress and Health Management, Team Dynamics and Decision Making, derived ofcritical debates and perceptions of restrictive and positive aspects at work, promoted by iterations and interactions among a diverse scope of complex system´s segments, although this didn´t affect directly the update of TRM Training contents, from Error Management (EM) to TEM, towards predictive interventions; (iii) global understanding about a variety of operational realities with common safety purposes, helping to manage, without guilt, conflicts and paradoxes, although this didn´t seem to reach significant projections for future changes. The study suggests that Multimethodologymay be adapted to other applications undervalidation.