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The main purposes of this research are to develop a new scientific decision making model based on the Made in Vietnam lean management philosophy, that has been developed and applied successfully at over 200 enterprises in Viet Nam in order to support these enterprises in their business decisions. The model was built from the practical point of view (observation, surveys, in-depth interviews, case studies) for finding out the methods of optimal thinking in order to analyze the current situation, construction, development, as well as verification of the optimal models. The model proposed in this research has been confirmed valid by both big businesses and SMEs in Vietnam. The model can be used not only for Vietnamese enterprises but also for other enterprises in both developing and developed countries.

The purpose of this research is to develop the method of organizational development strategy planning which most fits with the specific conditions of Vietnamese business associations. The results of this research may help to solve the problem of the shortage of effective organization development strategy for the associations causing the associations' functioning and developing not as expected as their important role. By using qualitative and quantitative methods including case studies, AHP and TOPSIS this research investigated the existing strategic planning methods to define the most suitable strategic planning method for the associations. Main findings of the research include (1) The matrix method should be the most suitable method for the strategic planning of Vietnamese business associations; (2) A first-ever complete method for development strategy planning have been developed and introduced for Vietnamese business associations including the procedure for implementation which matches with their own set of strategic activities;(3) The authors also contributed to the approach of multi-criteria ranking by using a combination of the ten-seed-exercise, AHP and TOPSIS with similar accuracy instead of the complicated calculation using fuzzy AHP and TOPSIS. The recommended method of strategic planning recommended by this research could be useful in applying for not only Vietnamese business associations but also to the business associations, non-profit organizations and businesses in Vietnam and the world for a sustainable development of the organizations and the economy.