In the course of planning and implementation of projects it occurs frequently that after the preliminary calculation of the optimal resources allocation - in order to obtain minimal total cost - a project can not be realized at a price which is expected by the inviter of the tender. In the following study we present a method by which, in case of a delimited maximal budget, we are able to determine the schedule, cost demands and resource requirements of a project to be implemented with the highest possible quality. © Springer Science+Business Media B.V. 2008.