Please give me some advice and instructions on how to do it. like how we draw when we have several actors. I need just a guide on how to draw a complete checkout and make a purchase sequence diagram separately. I created a sequence diagram for login, but I don't know if I have to take authentication as an actor or not. This Online Shopping Management Systems barreiro zen - UML Sequence Diagram Online Tool online bookstore sequence diagram mean WebNo. In addition, you can use class diagrams to model the objects that make up the system, show how the objects relate to each other, and explain what the objects do and what services they offer. I'm trying to sketch some use cases, but for example, when it comes to completing checkout, there are many actors, and I'm not sure how to do it when there are more actors. UML Class diagrams of Online Shopping show how your system or subsystem is put together. I googled and learned about sequencial diagrams, but I didn't find anything like this.
For example, when I come to the checkout sequence diagram, I can assume that the procedure is done through view items, but in the view items sequence diagram, I must clearly draw the procedure sequence.
According to this use case diagram, I have to draw a sequence diagram for each use case except login by making an assumption.
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