Use Case Diagram for the Online Stock Brokerage System

Let’s build the use case diagram of the online stock brokerage system and understand the relationship between its different components. First, we’ll define the different elements of our online stock brokerage, followed by the complete use case diagram of the system.

System

Our system is a stock brokerage.

Actors

Now, we’ll define the main actors of our online stock brokerage system.

Primary actors

• Member: The Member is the main user of the system who can create, update, or cancel an account, log in and out, and reset their password. Members can search for stocks, manage watchlists, view stock positions, and place different orders (market, limit, stop-loss, and stop-limit). They can select stock details, cancel orders, and perform transactions via electronic transfer, wire, or check. Members also receive notifications about order and transaction statuses.

Secondary actors

• Admin: The Admin manages user accounts. They can create, update, or cancel accounts, log in and out, reset passwords, and block or unblock Members when necessary.

• System: The System handles internal processes such as fetching stock quotes, sending order details to the stock exchange, acknowledging ...