They illustrate how the different parts of a system interact with each other to carry out a function, and the order in which the interactions occur when a particular use case is executed. Sequence diagrams, commonly used by developers, model the interactions between objects in a single use case. Among the three, sequence diagrams are preferred by both developers and readers alike for their simplicity. These diagrams are used to illustrate interactions between parts within a system. There are 3 types of Interaction diagrams Sequence diagrams, communication diagrams, and timing diagrams. Responsibility category: Order choose Change,The number of selectable, express delivery address, payment options, etc.This sequence diagram tutorial is to help you understand sequence diagrams better to explain everything you need to know, from how to draw a sequence diagram to the common mistakes you should avoid when drawing one. The purpose: to provide users browse, payment, generate orders, consult the business functionĬlass of Liability: add items into the order form Responsibility category: input by the user to search for specific commodities Responsibility category: recommended product to the user Structure: Recommended goods category,Search category Objective: In this understanding to provide users with complete detailed product parameters, search, select merchandise

Responsibility class: the database query registration information is correct

Responsibility class: package user login information Responsibility category: collecting user login account password Organizations: login interface classes,Login control class, database interaction class. Objective: To make users registered log into the system Responsibility category: check whether the presence of the same in the database,The compliance is added to the membership database.

Responsibility category: information on the registration initial feedback norms,Package Registration Information Responsibility class: the customer is prompted to enter information in the specified format, collecting registration information submitted to the back-end authentication Organization: The main control is a registered class, back-end authentication interface to interact with the database certification classįunction: Finish tourists registered, assigned a unique member ID Objective: To allow unregistered visitors registered on the system, user information query validation and specification, to get a member account Third experiment Links :: Third experiment Experiment two links: The second experiment

System sequence diagram online shopping