P3 is a product of Primavera Systems Inc. along with its products, such as Primavera Enterprise, Primavera Expedition, Primavera TeamPlay and SureTrak Project Manager. The company is established in the 1983 and has become a one of the major leading company ever since. P3 originated from a company in Bala Cynwyd in Pennsylvania.
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The need for proper planning and scheduling of construction projects is crucial for all parties involved. The major parties involved in a construction project are the owner, consultants and the contractors.

The owner uses schedules and plans in the aspect of monitoring. Indirectly, he gains control over the project. Another importance of scheduling to the owners is to predict the financial needs of the project.

The scheduling significance for the consultants is in the form of activities like research, design, and estimation, and documents preparation.

Scheduling is a crucial to the contractors. Scheduling is used as a tool in determining the quantity of labor, the types and quantity of plants, the time duration of an activity, the time and duration for material supplies and to estimate financial flow and need. By proper planning and scheduling, contractors increase the possibility that a project will be completed within budget, will be within the time constraints, and will have better quality, and they can reduce the chances of chaos breaking out.

Scheduling provides an important role in a construction project. Where there is no plan, where the disposal of time is surrendered merely to the chance of incidence, chaos will soon reign (Victor Hugo, 1802-1885). Without a plan, there is no way to schedule the required work, no way to track progress, and no way of deciding on corrective action when unexpected events occur (Stella and Glavinich, 1994).

Scheduling is taking the construction plan one step further, through ‘‘determination of the timing of the operations comprising the project and their assembling to give the overall completion time’’ (Antill and Woodhead, 1990)