What is network scheduling with limited resources

What is network scheduling with limited resources? 

Explain its importance.Ans. The applicability of critical path scheduling is limited by the inability of the algorithm to cope with conflicting resource demands. This paper is an assessment of the effectiveness of many of the heuristic extensions to the critical path method which resolve the conflicts that develop between the resources demanded by an activity and those available. These heuristic rules are evaluated on their ability to solve a large multi project scheduling problemIn today's highly competitive environment, management is continually seeking new and better control         techniques to cope with the complexities, masses of data, and tight deadlines that are characteristic of many industries.In addition, management is seeking better methods for presenting technical and cost  data to customers.Since World War II, scheduling techniques have taken on paramount importance. The most common of these techniques are shown below:

1. Gantt or bar charts

1. Milestone charts

1. Line of balance

1. Networks

o  Program Evaluation and Review Technique (PERT)
o  Arrow Diagram Method (ADM) [Sometimes called the Critical Path Method (CPM)]
o  Precedence Diagram Method (PDM)
o  Graphical Evaluation and Review Technique (GERT)
Benefits and Advantages of Scheduling:
The Program Evaluation and Review Technique (PERT) perhaps is the best known of all the
relatively new techniques. PERT has several distinguishing characteristics:
It forms the basis for all planning and predicting and provides management with the ability
to plan.
It enables management for best possible use of resources to achieve a given goal within
time and cost limitations.
It provides visibility and enables management to control ''one-of-a-kind" programs as
opposed to repetitive situations.
It helps management to handle uncertainties involved by answering the following questions
that provides management with a means for evaluating alternatives:
a) How time delays in certain elements influence program completion?
b) Where slack exists between elements?
c) What elements are crucial to meet the completion date?
It provides a basis for obtaining the necessary facts for decision making.
It utilizes a time network analysis as the basic method to determine manpower, material,
and capital requirements as well as providing a means for checking progress.
It provides the basic structure for reporting information.
It reveals interdependencies of activities.
It facilitates "what if" exercises.
It identifies the longest path or critical paths.
It allows us to perform scheduling risk analysis