Convenient matrix calculation method for critical path in twin code network chart;

This paper analyzes the time-scaled network plan applied to confirm critical path,gain time factors,control network plan and so on.

Based on the study of calculating approaches of fuzzy network,this paper puts forward a new method to calculate the parameters and determine the critical path of fuzzy network planning.

Solve the critical path problem by the shortest path method;

This paper focus on deploying resource,make use of the different completion probability of critical and un-critical path,the authors suggest a schedule optimization algorithm based on transferring resources from un-critical path to critical path purposely,and the result of applying the model shows that the method is practical for optimizing project schedule with resourc.

The limitation of the PERT in the planning of construction schedule is studied for two cases, where there are several critical paths, or the sub critical path is close to the critical path.

This paper analyses and discusses the implication and calalation of all types of time gaps in network program technique and then probes into how to use time gaps to determine the key line to realize the optimization of network.

According to the definition of the key line in a network plan, the paper analyzes the basic structure of net-work plan and proposes a new method of determining key line in a network plan-the filtering arrow line method.

The application of the dual node network chart in large-scale pipeline construction project discussed the key line for the determination of the macro-grasp.