Lecture 8 - analysis and design mode

Question 1

what is the aim of the analysis and design model?

Answer 1

analysis model - gain understanding of the application domain (capture requirnments)
design model - produce a model to be used for implementing the system

Question 2

what does an analysis model include?

Answer 2

use case diagrams, use case descriptions, domain class diagrams, state machine diagrams and activity diagrams

Question 3

what does a design model include?

Answer 3

design class diagrams, state machine diagrams, sequence diagrams, atomic use specifications (atomis use cases are specific to our particular method)

Question 4

what is a logical and detailed design model?

Answer 4

logical - what we do

detailed - UI, components to provide data persistance, etc

Question 5

explain association in terms of design model?

Answer 5

associations - if class contains element of another

Question 6

what are top-level entries?

Answer 6

permits: set is a system (allows entry points to access the domain objects stored in the system)

Question 7

what must top-level entries and navigation paths ensure?

Answer 7

that we can reach every donmain object (system object)

Question 8

attributes of a one-to-one association?

Answer 8

no new classes, include an object of the other classes type as a member of class at tail of arrow

Question 9

attributes of a one-to-many association?

Answer 9

no new classes, include a STL container that holds class objects from the many side

Question 10

attributes of a many-to-many association? (without relationship attributes)

Answer 10

either include set of classes of many type in both, or introduce a new class that holds a member of each type.

Question 11

attributes of a many-to-many association? (with relationship attributes)

Answer 11

introduce new lass that holds new attributes

Question 12

attributes of a ternary or higher order association?

Answer 12

have to introduce new class to represent association

Question 13

give an example of when we may change a relationship? (order and customer)

Answer 13

customer and order have a one to many relatioship, but we may make it a one-to-one relationship if we dont want customer info to be shared amongst order objects (now when customer makes 2 orders 2 it treats this customer as 2 different unrelated people)

Question 14

what should classes include in a domain class diagram?

Answer 14

all attribute names, if useful then add attribute types and/or methods