How we draw a usecase diagram from a case study?

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A Use Case model can be developed by following the steps below.

1.Identify the Actors (role of users) of the system.
2.For each category of users, identify all roles played by the users relevant to the system.
3.Identify what are the users required the system to be performed to achieve these goals.
4.Create use cases for every goal.
5.Structure the use cases.
6.Use <<include>>,<<exclude>> relationships based on the requirement.
7.Prioritize, review, estimate and validate the users.

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We can draw a use case diagram by this following steps:-

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

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Following are the steps while preparing the use case diagrams
the following steps:

1- Identify who is going to be using the website/app.
2- Pick one of those users.
3- Define what that user wants to do on the site/app. Each thing the use does on the site becomes a use case.
4- For each use case, decide on the normal course of events when that user is using the site.
5- Describe the basic course in the description for the use case. Describe it in terms of what the user does and what the system does in response that the user should be aware of.
6- When the basic course is described, consider alternate courses of events and add those to "extend" the use case.
7- Look for commonalities among the use cases. Extract these and note them as common course use cases.

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1. Identify the actors of the system.
2. For each category of user, identify all roles of users in the system.
3. Identify what are the users required the system to be performed to achieve.
4. Create use cases for each goal.
5. Structure the use cases.
6. Prioritize, review, estimate and validate the users.

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1. Identify sequence of actions of proposed system
2. Convert all actions into essential use cases and supporting use cases and mention them within the system
3. Identify primary and secondary actors
4. Identify actors performing above actions
5. Draw appropriate relationships between use cases and actors
6. We generally don?t model system names like laptop or desktop ,database names, networks,technology names

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To draw use case
1- Identify who is going to be using the system/application.
2- Pick one of those users.
3- Define what that user wants to do on the site/app. Each thing the use does on the site becomes a use case.
4- For each use case, decide on the normal course of events when that user is using the site.
5- Describe the basic course in the description for the use case. Describe it in terms of what the user does and what the system does in response that the user should be aware of.
6- When the basic course is described, consider alternate courses of events and add those to "extend" the use case.
7- Look for commonalities among the use cases. Extract these and note them as common course use cases.