This paper deals with issues of strategic management, particularly strategic planning and its beneficial effect on the overall performance of businesses. It is based on empirical results of the original research study called Adaptability of Enterprises to Contemporary Economic Conditions in Years 2007-2012 performed via questionnaire survey in three rounds during years 2011, 2012 and 2013. The analyses presented in the paper were conducted on the second round sample of 677 organizations operating mostly in the SME sector in the Czech and Slovak Republic.The interdependence between the level of strategic planning (existence of strategy in the form of written document and its extent) and enterprise performance criteria (turnover, costs, profit, EVA, investments, period of arranged contracts) is examined with the use of four hypotheses. The results are commented and discussed. The outcome is the apparent positive impact of full strategic document on the performance criteria of the businesses.

This paper deals with the influence of implemented quality and environmental management systems ISO 9000 and ISO 14000 on enterprise performance. The paper delivers original results and comments on realized and processed questionnaire research concerning approx. 700 companies operating through Czech and Slovak Republics, called "Adaptability of entrepreneurship", financed by Silesian University in Opava. The paper evaluates the difference in enterprise performances as an effect of implementation of ISO management systems. The performance of 4 groups of companies (no ISO implemented, ISO 9000 implemented, ISO 14000 implemented and both ISO 9000 and 14000 implemented) is compared. 14 criteria were selected for evaluation, which can be marked as enterprise sustainability aspects. Three hypotheses were tested. The results show visible improvement in performance and awareness of selected priorities at companies with implemented ISO management systems. Problematic and results are discussed and compared with similar researches published inprofessional literature.The most important results of the paper were presented