Construction Management-Lec3 Planning and Scheduling-II . Dr. Attaullah Shah. Schedule Development Techniques . Schedule Network Analysis Schedule network analysis is a technique that generates the project schedule. Critical path method (CPM), Critical chain method, what-if analysis, and
Dr. Attaullah Shah
Schedule Network Analysis
An example would be to construct the foundation for a building before all the architectural drawings are complete. Fast tracking can result in rework and increased risk. This approach can require work to be performed without completed detailed information, such as engineering drawings. It results in trading cost for time, and increases the risk of achieving the shortened project schedule.
Project management scheduling software is widely used to assist with schedule development. Other software might be capable of interacting directly or indirectly with project management software to carry out the requirements of other Knowledge Areas, such as cost estimating by time period.
Project calendars) and resource calendars identify periods when work is allowed. Project calendars affect all activities. For example, it may not be possible to work on the site during certain periods of the year because of weather. Resource calendars affect a specific resource or category of resources. Resource calendars reflect how some resources work only during normal business hours, while others work three full shifts, or a project team member might be unavailable, such as on vacation or in a training program, or a labor contract can limit certain workers to certain days of the week.
Since the improper use of leads or lags can distort the project schedule, the leads or lags are adjusted during schedule network analysis to develop a viable project schedule.
Schedule data and information are compiled into the schedule model for the project. The schedule model tool and the supporting schedule model data are used in conjunction with manual methods or project management software to perform schedule network analysis to generate the project schedule.
tp + 4 tm + to
Mean (expected time): te =
tp - to
Variance: Vt =2 =PERT: Program Evaluation and Review Technique
Determine probability that project is completed within specified time
where = tp = project mean time
= project standard mean time
x = (proposed ) specified time
TimeNormal Distribution of Project Time
CPM/PERT can answer the following important questions:
To overcome the limitation, Monte Carlo simulations can be performed on the network to eliminate the optimistic bias