The article describes the computerization process in the Library Collection and Completion Department (LCCD) of the Jagiellonian Library, regardingits integrated library system. The AFAS software for collection processes, offered by the VTLS Company at the beginning of the 90ties, and being usedby the Jagiellonian Library as the oniy one in Poland, has not been satisfying, regardless its significant work improvement. However, a narrow range offunctions resulted in the decision on creating an own software, instead of buying current collection module of Virtua. As one can observe, the LCCD does nothave to register bibliographical data of incoming unordered volumes, but onIy those which are going to be ordered. Books incoming for free, after collectiveregistration and accession, are passed at once to the lndexing Department.