SEQUENCE DIAGRAM DOTTED LINE SOFTWARE

Structural models of software display the organization of a system in terms of the components that make up that system and their relationships. Interactions between objects are indicated by annotated arrows. The objects and actors involved are listed along the top of the diagram, with a dotted line drawn vertically from these. UML sequence diagrams are used to model the interactions between the actors and the objects within a system.ДЄ sequence diagram shows the sequence of interactions that take place during a particular use case or use case instance. The receptionist backs out of the use case. The receptionist does not have the necessary security credentials.Дўa.2. PRS verifies the security credentials of the receptionist.Дўa. Receptionist selects the 'Transfer data' option from the menu.Дў.

The receptionist must have appropriate security permissions to access the patient information and the PRS.ДЎ. Patient data has been collected (personal information, treatment summary) Medical receptionist, patient records system (PRS) The information transferred may either be updated personal information (address, phone number, etc.) or a summary of the patient's diagnosis and treatment. The example below shows a UML activity diagram describing the process of involuntary detention and the role of MHC-PMS (mental healthcare patient management system) in it.ДЄ receptionist may transfer data from the MHC-PMS to a general patient record database that is maintained by a health authority. UML activity diagrams may be used to define business process models. Process models reveal how the system being developed is used in broader business processes. The position of the system boundary has a profound effect on the system requirements.Дefining a system boundary is a political judgment since there may be pressures to develop system boundaries that increase/decrease the influence or workload of different parts of an organization.Д¬ontext models simply show the other systems in the environment, not how the system being developed is used in that environment. They show other systems that are used or depend on the system being developed. System boundaries are established to define what is inside and what is outside the system. Social and organizational concerns may affect the decision on where to position system boundaries.ДЄrchitectural models show the system and its relationship with other systems. Engineers use these models to discuss design proposals and to document the system for implementation.Д¬ontext models are used to illustrate the operational context of a system - they show what lies outside the system boundaries. Models of the new system are used during requirements engineering to help explain the proposed requirements to other system stakeholders. These then lead to requirements for the new system. Models of the existing systems help clarify what the existing system does and can be used as a basis for discussing its strengths and weaknesses. Models of both new and existing system are used during requirements engineering. State diagrams, which show how the system reacts to internal and external events.Class diagrams, which show the object classes in the system and the associations between these classes.Sequence diagrams, which show interactions between actors and the system and between system components.Use case diagrams, which show the interactions between a system and its environment.Activity diagrams, which show the activities involved in a process or in data processing.A behavioral perspective, where you model the dynamic behavior of the system and how it responds to events.ДЇive types of UML diagrams that are the most useful for system modeling:.A structural perspective, where you model the organization of a system or the structure of the data that is processed by the system.An interaction perspective, where you model the interactions between a system and its environment, or between the components of a system.An external perspective, where you model the context or environment of the system.

Models can explain the system from different perspectives: Models help the analyst to understand the functionality of the system they are used to communicate with customers. It is about representing a system using some kind of graphical notation, which is now almost always based on notations in the Unified Modeling Language ( UML). System modeling is the process of developing abstract models of a system, with each model presenting a different view or perspective of that system.

Sequence diagram dotted line