SYSTEMS ANALYSIS AND DESIGN WITH UML PDF
Systems analysis & design: an object-oriented approach with UML/Alan Dennis, Systems Analysis and Design (SAD) is an exciting, active field in which. Systems analysis and design /Alan Dennis, Barbara Haley Wixom, through UML , the new standard for object-oriented analysts and design, as .. business analysis benchmark - full resourceone.info; accessed February,. Systems analysis design, UML version an object oriented approach/Alan Dennis, Barbara .. oriented systems analysis, the Unified Process, and the UML .
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Object Oriented Analysis and Design Using UML A Whitepaper by Mark Collins- Cope of Ratio Group. DOWNLOAD PDF The following Object Model shows a simple Banking System, containing classes for Head-Office, Branch, Accounts. Syllabus MIS and Systems Analysis and Design & Project Management Fall T-Th, a.m. (class) T-Th, p.m. (lab) . Systems analysis and design /Alan Dennis, Barbara Haley Wixom, Roberta M. through UML , the new standard for object-oriented analysts and design.
The important point to note hear is that we are first working out what relationships we need to represent in our system "belongs-to", etc. Put another way, Object Modelling allows us to focus on exactly what problem we are trying to solve, before we look at the best way of implementing our model in a particular programming language.
Lets take a look at a sub-set of our previous example: Figure 4 - Subset of Banking Model Our Object Model shows us that we need four classes: Transaction; Account; Current Account and Savings Account, and that our implementation must enable us to represent the fact that any particular Account has two sets of Transactions associated with it - which will be needed to implement the PrintStatement method. Here we have a number of choices: linked-lists; collection-classes; dynamically bounded arrays of pointers; etc.
Of course, better implementations of the "debit-from" relationship are possible, but the fact that the Account class interface completely hides the underlying implementation of this relationship means that we can improve on our first cut implementation at a later date with little impact on our overall system code.
In other words, use of the Account class interface has limited the impact of the relationship implementation method: something we strive to achieve when writing OO based applications.
This is implicit in our Object Model, and is what the system's users would expect to see. To see why, consider the case when a new Transaction value is entered in error.
System Analysis and Design with UML Version 2.0
The Transaction is linked to two accounts "debit-from" and "credit-to". If the Transaction object is shared, only one object need be modified to rectify the situation.
Using two objects would either mean that either the system has to update two objects equals more coding work , or that the user has to update two Transactions equals greater potential for mistakes. Although our Object Model "debit-from" relationship uses a linked list, there are many alternatives to this choice - including the use of a relational database to underpin the system. The point is, however, no matter what mechanism is used, we are actually trying to implement a "many-to-one" relationship between an Account and a Transaction.
It is this relationship that exists in the banking problem domain - not a relationship involving linked lists or collection classes. Object Modelling enables us to spot the relationship required by the problem domain, and then choose the best way of implementing it. So far, we have only implemented the "debit-from" relationship in one direction- from the Account class to the Transaction class.
Our model does not yet specify in which direction the relationship will be traversed.
Systems Analysis Design UML 5th ed
If we need to traverse the relationship in both directions - getting from the Transaction to the related Account - our implementation will prove insufficient, and some form of double pointer schema may be needed. Much work would have been saved if we had known this fact before we had started writing the code.
Although our Object Model provided a starting point for our implementation, it was not complete, for example new methods have been added to the Account class.
Other factors may also influence our choice of implementation: do we need a direct form of access - for example using a Transaction number to go directly from the Account to the relevant Transaction?
If we do, then a linked-list will prove an inefficient choice of implementation. Again, it would be very useful to know this type of information before we start trying to implement the relationship.
From these points we can see that we need to consider the wider requirements of our system before we can come up with the right implementation of our "debit-from" relationship not to mention the many other classes and relationships that might be required. We can't produce a good design for a system unless we consider all the required functionality - in detail. Use Cases provide the mechanism for doing this.
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They provide a useful technique which, in conjunction with Object Modelling, help us to clarify exactly what the system is supposed to do. Each type of user typically has their own particular set of requirements for a system: hence identify user types assists in identifying all the required system functions.
The Use Case diagramming technique allows us to make a first cut at defining the system requirements, and will help us in presenting these requirements back to the users of the system. It also partitions the system into single atomic business functions, which may be used as a basis for costing the system, or for planning a phased system delivery.
There are booking process clerk and reception staff who manages it. A customer can pay his bill by credit card or pay utility bill.
What are the phases stages of it? Which phase requires maximum efforts? Also explain why domain analysis i.
Under what situation activity diagram should not be used? Which diagrams are preferable under such situations?
Also give practical situations, when to use the following diagram:a. If yes, give example, if no, give reason. Create a class hierarchy to organize the following drink classes: Mineral water, wine, alcoholic, nonalcoholic, grape juice, soda, bears. Draw the use-case diagram for Hotel Information System. There are two types of customers: Tour-group customers and Individual customers. Both can book, cancel, check-in and check-out of a room by Phone or via the Internet.
There are booking process clerk and reception staff who manages it. A customer can pay his bill by credit card or pay utility bill. What are the phases stages of it?Appendix A. Do likewise when creating personal work plans to complete assignments. Millions of programmers in all languages have found UML to be an invaluable asset to their craft. So far, we have only implemented the "debit-from" relationship in one direction- from the Account class to the Transaction class.
Submit as email attachment. The important point to note hear is that we are first working out what relationships we need to represent in our system "belongs-to", etc.
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