In order to deal with complexity, both in science and practice the importance of flexibility and adaptiveness in the design and management of human activity systems is stressed. However, existing frameworks of procedures, practices and rules often require strict planning, design and implementation. These requirements seem to be at loggerheads with one another. In this publication I take a complexity perspective to examine as to how flexibility and adaptiveness comply with these existing frameworks to arrive at effective and efficient project realization. A grounded analysis of the Dutch A2 Passageway Maastricht infrastructure project, instigated by the question how the influence of the management system on the provisional outcomes of the project can be explained, found that it involves system synchronization: combined system fragmentation and integration.