Network diagram controls the scheduling, control and monitoring of projects. It analysis the time problems in the planning of the intention development and projects, which particularly display dependencies between activities. The network elements are the events and activities. Their start and finish are clearly defined. The activities are arranged in a sequence and their costs and time will be estimated. The network diagram is a display form, where resources, technical and material efforts are also estimated. Some of the network diagrams contain also occurrence probability to take into account the uncertainty factor.
The effective project management can easily find out thanks to this technic, which project duration is planned, which risk factors should be considered, which activities are critical, whether the real time of the project process corresponds the planned one, whether a project has a time deviation, how the acceleration can be performed with the low costs.