摘要：The first ISO 9000 certificate to an organisation in the Republic of Croatia was issued on 13th November 1993. The number of organisations with certified quality system is continuously growing. The question that troubles researchers in many countries is whether, and to what extent, the certified quality system in pursuance of any international ISO 9000ff norm, contributes to business successfulness of certified organisations. The goal of this research was to determine whether certified quality system related to any international ISO 9000ff norm has effects on business successfulness of certified organisations. The results of the research have shown that quality system is especially important for those Croatian organisations, which seek to establish their position on international market. Especially concerning fact is that the biggest entrepreneurs (biggest with regard to total income in the tourist branch of the economy in the surveyed years) did not use the possibility to build, implement and certify quality system in accordance with requirements of ISO 9000ff international norms and thus improve their business successfulness.
