How we draw a usecase diagram from a case study?

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- We first identify the primary and secondary actors in the case study
- Then we identify the actions performed by each actor to draw use-cases
- We identify the relationships between the use-cases
- Then we identify the relationships between the actors
- We then identify the secondary actor involved with the use-cases

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first we try to under stand the complete scenario of case study in and out and later we have to identify the primary and secondary actor then we have draw the system boundary in that system boundary we have to create a essential use cases and and identify the connection and draw the relations between the use cases and actors and we have to mention complete sequence an use cases briefly.

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The steps involved in drawing a use case diagram from a case study are:
1. Analyze the different actions to be performed as per the case study.
2. Put all the actions in a sequential order.
3. Analyze the actor who is performing the actions in case study.
4. Figure out essential use case and supporting use case.
5. Identify some modules with respect to functionality or usage.
6. Formulate the relationship between Actors and Usecases.
7.Information which we do NOT model in Use Case diagrams are
➢ Names of the systems (laptops, Desktops, Workstations),
➢ Architectures (2 Tier, 3 Tier, n Tier, Client Server),
➢ Databases Names (DB2, SQL Server, My SQL)
➢ Networks (LAN, WAN, Internet),
➢ Brand Names (HP, Lenova, Wipro, Sony),
➢ Technology Names ( Java, .Net, Mainframes)

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use case diagram is used to show the dynamic behavior of the system
use case contains
1.  actors
2. use cases
3. Relationships
4.  system itself

we have gathered the requirements from the case study and we have drawn a use case diagram
we do not mention the company names and networks and brands and software and database names
we have given the proper relationships
we have arrange the sequence of use cases
   

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Identify the Actors (role of users) of the system.
For each category of users, identify all roles played by the users relevant to the system.
Identify what are the users required the system to be performed to achieve these goals.
Create use cases for every goal.
Structure the use cases.
Prioritize, review, estimate and validate the users.

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   How we draw a usecase diagram from a case study?

1.   Information which should not model are name of the system. Architectures, data base names, Network, Brand Names, Technology
       Names
2.   Differentiate information against actions
3.   should write all sequence of actions
4.     should find out which actor is performing which action
5.   should identify Essential Use Cases and Supporting Use Cases
6.   should find out some modules with respect to functionality
7.   should draw the relationships appropriately between the identified actors and Use Cases