At present we can see how the quality of building production presents many facts for dissatisfaction. The amount of losses is extremely large and the national economy cannot tolerate it. In the EU attempts were made to solve quality problems by organizational means. Consequently, in the 1980s appeared and in 1994 were altered the codes ISO 9000 which are to be used up to 2004. On the other hand, a different tendency may be observed. So-called “lean production” in Japan industry showed that good quality can also be achieved by low prices. It should be mentioned that the above-mentioned experience and knowledge are first of all applied to industry. Hence they cannot be adopted directly in building construction. A control through self-contr...