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. 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. One may include multiple actors in a sequence diagram. If you want to know how to create sequence diagrams for use cases that have an include relationship, please open a new question focusing on that issue. I googled and learned about sequencial diagrams, but I didn't find anything like this. You have multiple issues, but the most important issue seems to be about how to deal with multiple actors in a sequence diagram. 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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