The SSD graph: a tool for project scheduling and visualization

A graphic tool, the SSD (structure, states and deviation) graph, is proposed for three important phases of project management; planning and scheduling, control, and evaluation. The SSD graph represents the structure, states (scheduled and actual states), and deviation of a system. A project management system using the SSD graph is developed, and it visualizes the actual state of a project and keeps the historical record of the project performance. This system allows a project manager to see the overall status and to review the project performance. Several applications have shown its usefulness for scheduling and control of project systems