Project Report of Electricity Billing System Page 1


Project Report of Electricity Billing System



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Project Report of Electricity Billing System 
 
Page - 26 
objects. In UML, this grouping mechanism is package. The term package diagram for a 
diagram that shows packages of classes and the dependencies among them. 
A dependency exists between two elements if changes to the definition of one 
element may cause to other. With classes, dependencies exist for various reasons: one 
class sends a message to another; one class has another as part of its data; one class 
mentions another as a parameter to an operation. A dependency between two 
packages exists; and any dependencies exist between any two classes in the package. 
State diagram
: State diagram are a familiar technique to describe the behavior of a 
system. They describe all the possible states a particular object can get into and how 
the objects state changes as a result of events that reach the objects. In most OO 
technique, state diagrams are drawn for a single class to show the lifetime behavior of a 
singe object. There are many form of state diagram, each with slightly different 
semantics. The most popular one used in OO technique is based on David Harel’s state 
chart. 


Project Report of Electricity Billing System 
 
Page - 27 
PERT CHART (Program Evaluation Review Technique) 
PERT chart is organized for events, activities or tasks. It is a scheduling device that 
shows graphically the order of the tasks to be performed. It enables the calculation of 
the critical path. The time and cost associated along a path is calculated and the path 
requires the greatest amount of elapsed time in critical path. 
 
PERT Chart representation 
Specification 
Design 
Database 
Part 
Design GUI 
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