الفهرس 
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Abstract
In a construction project environment there is always a risk or chance that adverse conditions could occur, which could cause the project to fail, or couldn’t meet its planned objectives. The importance of Planning and Time scheduling has emerged in the last decade and it becomes an essential step for any construction project to reduce this risk. The project schedule should reflect all of the work associated with delivering the project on time. Without a full and complete schedule, the project manager will be unable to communicate the complete effort, in terms of cost and resources, wish are necessarily to deliver the project. Most current methods of time scheduling and estimating have been converted to software programs in order to be easy to be used by planners and to avoid manual mistakes. Presently, experts in the fields of time planning are searching for better software they can depend on; that is more powerful, easier and serves different kinds of projects. This study develops a program that is essential for improving time planning and estimating for projects that repeat linearly. Results of this thesis research show that factors affecting projects (that repeat linearly) end date probability and also introduces a study for the non-critical paths with very high variances that may governs the project network in certain conditions. Keywords: Time planning, PERT method, Line of Balance method, Excel program, Repetitive construction projects, Project management, Egypt.