In the year 1998 the Standards and Metrology Institute co-financed a research regarding The influence of ISO 9000 on competitiveness of enterprises and other organizations in Slovenia. This book is an comprehensive report of conducted research. Anybody, interested in some details can find a summary on the next web homepage of University of Maribor: http://www.uni-mb.si/new/epf/okv an.htm. in the left frame press button "Raziskave" (=researches). The development of the quality systems according ISO 9000 in its basic intention specially emphasizes the part of the management. The Slovene experience, presented in our analysis incontestably leads to the conclusion that the introduced quality system according to ISO 9000 has positively influenced first of all those processes in the organization that are connected with and depending on ISO 9000 standard. Knowing that the priority of them is the control of the performance level of business processes, the data given by the analysis are expected. Our data show that the control of the business processes development is a great unexploited potential of the Slovene management. The analysis of the triennial period of the organizations with the ISO 9000 certificate shows that the situation is paradoxical. On one side the quality system according to ISO 9000 should permanently improve the performance viewpoint of business processes, on the other hand the negligence of their development viewpoint shows the lack of motives to develop the quality system. On behalf of the project executive personnel, we would like to express our sincere thanks to all enterprises, organizations and certification bodies that took an active part in this research.