The Model for the Description of the Dynamic Behaviour of the Project Processing

Abstract

The paper deals with the problem of many projects – the difference between designed activities processing and real project implementation. The reason is the rework of many activities that is omitted in the project proposal. The consequences are the project delay and the budget overrun. The reason for the described problems is the low quality of same processed activities and the changes in project goals. This research work is focused on the development of the dynamic model that describes the project processing. The model is based on the system dynamics methodology. The main stocks are the amount of the activities expressed as the number of man-days. The changes in the stocks are influenced by the flows. The main flow is processing rate and reworking rate that influence the project dynamics. The auxiliary subsystem deals with human resources. The number of workers has the relationship to all flows of the system. The model can be used for the simulation of the dynamic behaviour of the complex projects. The outputs from the designed model are compared with model that is based on standard approach. It means the project model includes only unprocessed activities and processed activities with one processing flow. This model does not include rework activities. The results of the simulations present the difference in time according to the quality rate and the change rate. It can help to understand the key reasons for the project delay and consequently for the budget overrun.