Project Report of Electricity Billing System Page 1

 
 

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Project Report of Electricity Billing System 
 
Page - 25 
Association
: Association represent between instances of class. From the conceptual 
perspective, association represents conceptual relations between classes. Each 
association has two roles. Each role is a direction on the association. A role also has 
multiplicity, which is a indication of how many object may participate in the given 
relationship. 
Generalization
: A typical example of generalization evolves the personal and corporate 
customer of a business. They have differences but also many similarity. The similarities 
can be placed in generalization with personal customer and corporate customer sub 
type. 
Aggregation
: aggregation is the part of relationship. It is like saying a car has engine 
and wheels as its parts. This sounds good, but difficult thing is considering, what is the 
difference is aggregation and association. 
Interaction
: interaction diagrams are models that describes how groups of objects 
collaboration in some behavior. 
Typically, an interaction diagram captures the behavior a single use cases. The 
diagram shows a number of example objects and the messages that are passed 
between these objects in use cases. These are following approaches with simple use 
case that exhibits the following behavior. 
Objects can send a message to another. Each message is checks with given 
stock item. There are two diagrams: Sequence and Collaboration diagram. 
Package Diagram
: One of the oldest questions in software methods is: how do you 
break down a large system into smaller systems? It becomes difficult to understand and 
the changes we make to them. 
Structured methods used functional decomposition in which the overall system 
was mapped as a function broken down into sub function, which is further broken down 
into sub function and so forth. The separation of process data is gone, functional 
decomposition is gone, but the old question is still remains. One idea is to group the 
classes together into higher-level unit. This idea, applied very loosely, appears in many 

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