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What are the tasks of the model
model subsystem the view subsystem and the controller subsystem?
1) Model subsystem:
-> store application domain knowledge
2) View subsystem:
-> display information to the user
3) Controller subsystem:
-> interact with the user and notify views about changes in the model
-> Divides an interactive application into 3 components:
1) Model:
-> contains the core functionality and data
2) View:
-> displays information to the user
3) Controller:
-> handles user input
-> Views and controllers together comprise the user interface
2) It is about dealing with complexity
3) It is about dealing with change
1) Number of simultaneous users supported
2) Amount of information handled
3) Number of transactions processed within certain time periods (average and peak workload)
1) Entity objects
-> Represent the persistent information tracked by the system (application domain objects, also called “business objects”)
2) Boundary objects
-> Represent the interaction between the user and the system
3) Control objects
-> Represent the control tasks to be performed by the system
Design focuses on solution domain
The solution domain is changing very rapidly
Halftime knowledge in software engineering: about 3-5 years
Cost of hardware rapidly sinking
Design knowledge is a moving target
What are the two major views of software lifecycles?
1) Activity centered:
-> Software development consists of a set of development activities
2) Entity centered:
-> Software development consists of the creation of a set of deliverables
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