Use case diagrams, decision tables. dr Tomasz Ordysiński

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1 Use case diagrams, decision tables dr omasz Ordysiński

2 Definition A use case diagram is a type of behavioral diagram defined by the Unified Modeling Language (UML). Its purpose is to present a graphical overview of the functionality provided by a system in terms of actors, their goals (represented as use cases), and any dependencies between those use cases. Use case diagram we can find several elements: : - use cases - actors - relations - system boundaries (optional)

Its purpose is to present a graphical overview of the functionality provided by a system in terms of

3 Connection with scenarios Use case diagrams are strongly connected witeh scenarios. Scenario is an example what is happening when someone or something interacts with a system. An example of scenario for medical clinic: patient calls to clinic to make appointment for annual healtjh check. he receptionist finds the nearest free date in appointments book and books it for a patient." Use case is a summary of scenarios of one task or goal.

An example of scenario for medical clinic: patient calls to clinic to make appointment for annual healtjh

4 Actor An actor is someone or something which initiates events connected with specific task. Actor describes a role of human or object. He picture below shows a case use Determining a term of control visit in medical clinic. An actor is a patient. Connection between an actor and case use is a communication. Comminication Actor Patient Determinig the term Case use

He picture below shows a case use Determining a term of control visit in medical clinic.

5 Example 1 Actors are represented by human figure. Use cases are represented by ovals. Communication is a line connecting actors and use cases. Use case diagram is a set of actors, use cases and communication lines. An examlpe shows 4 actors with 4 use cases. otice that one use case can have many actors. Visit cancellation Determinig the term Appointment s book Patient Order for doctor Doctor Bill payment Secretary

Use case diagram is a set of actors, use cases and communication lines.

6 Example 2 Video cassete rental Customer rents and returns video cassettes asking the employee to do those actions. An employee calculates a fee in case of returning the cassette after proper term and can add new or remove wasted cassettes. Customer using Internet can browse video catalog and book chosen cassettes. Adding new cassette Removal of wasted cassette Catalog browsing Employee Cassette rental Customer Searching for cassette Receiving returned cassette Fee calculation Booking a cassette

Customer using Internet can browse video catalog and book chosen cassettes.

7 Example 3 Cash dispenser Cash dispenser enables customer to withdraw money. o do so customer inserts a card, determines the amount of money, takes money and card. Customer can also check the available amount on his account. Once a while cash dispenser is replenished by service employee with money. Inserting a card yping the amount Money replenishing Money withdrawing aking out the card Customer Service employee Checking he account aking money

Customer can also check the available amount on his account.

8 Example 4 A system boundary rectangle separates the clinic system from the external actors. A use case generalization shows that one use case is simply a special kind of another. Pay Bill is a parent use case and Bill Insurance is the child. A child can be substituted for its parent whenever necessary. Generalization appears as a line with a triangular arrow head toward the parent use case. Include relationships factor use cases into additional ones. Includes are especially helpful when the same use case can be factored out of two different use cases. Both Make Appointment and Request Medication include Check Patient Record as a subtask. In the diagram, include notation is a dotted line beginning at base use case ending with an arrows pointing to the include use case. he dotted line is labeled <<include>>. An extend relationship indicates that one use case is a variation of another. Extend notation is a dotted line, labeled <<extend>>, and with an arrow toward the base case. he extension point, which determines when the extended case is appropriate, is written inside the base case.

Generalization appears as a line with a triangular arrow head toward the parent use case. Include relationships factor use cases into additional ones.

9 When used? Use case diagrams are used in 3 cases: Requirements definition. ew use cases very often generates new requirements while system is analyzed. Communication with customers. Simple form of this diagram is a good communication way between programmers and cutomers. Generic of test cases. Set of scenarios can suggest the way of testing this scenarios.

10 Decision table Decision table is a structure of set of connected decision rules description. Decision rule is an expression describing set of conditions which must be fulfilled to execute a set of activities. Symbols for conditions: Y condition must be fulfilled, condition must not be fulfielled, empty - condition unimportant. Symbols for processes: necessary process empty - process can be ignored. process 10 process 9 process 8 process 7 process 6 process 5 process 4 process 3 process 2 process 1 What shpould be done? () PROCESSES: Condition 6 Condition 5 Condition 4 Condition 3 Condition 2 Condition 1 Scenarios / CODIIOS:

Symbols for conditions: Y condition must be fulfilled, condition must not be fulfielled, empty - condition unimportant.

11 uzupełn. zbioru instytucji wykonujących zlecenia dla "Charona" (2) potwierdzenie wykonania usługi pogrzeb przygot. zmarłego do pochówku transport zwłok do firmy podział zadań dla pracowników uzupełnienie zbioru instytucji wykonujących zlecenia dla "Charona" (1) wypisanie zlecenia dla firmy zewn. zwrócenie się do innych firm świadczących usługi niezbędne do zreal. zlecenia zlecenie usług firmom współpracującym uzupełn. zbioru ewidencji wpłat (1) uzupełn. zbioru zleceń do wykonania (1) wystawienie pokwitowania uzupełn. zbioru upoważnień wystawienie upoważnienia do odebrania zwłok pobranie zaliczki uzgodnienie konkretnych warunków zlecenia (kosztorys) przedstawienie możliwości realizacji PROCESY: klient nie wpłaca reszty zapłaty klient wpłaca resztę zapłaty zlecenia Charona nie zostaną wykonane w terminie potwierdzenie wykonania usług zewn. w terminie klient nie wpłaca zaliczki klient wpłaca zaliczkę klient nie jest zainteresowany dodatkowymi usługami klient zamawia dodatkowe usługi klient nie czeka klient jest skłonny poczekać nie mamy wolnego terminu (zgodnego z oczekiwaniami klienta) mamy wolny termin (zgodny z wymaganiami klienta) WARUKI:

zwrócenie się do innych firm świadczących usługi niezbędne do zreal. zlecenia zlecenie usług firmom współpracującym uzupełn. zbioru ewidencji wpłat (1) uzupełn.

12 ask ask 1 prepare use case diagram for car garage which offers current repairs and periodic inspections. ask 2 Prepare simple decision table containing condition and processes for awarding a student with scholarship.

ask 2 Prepare simple decision table containing

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