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OOAD Chap 2 System Choice
1.
System Choice
Overview, Principles and Techniques Chapter 2 © ITU, February 09 1 The System’s Context System User Problem domain Application domain The purpose of system choice is to define the context of the system © ITU, February 09 2 Activities Re quirements Pro blem- Application- for use do main dom ain ana lysis analysis Situation Ideas Create foundation and For system design And interpretations criterion of relevance Component for Model design Speci fications of compo nents Systems System definition Specifications of archite cture Architectural design System definition: a concise description of a computerized system expressed in natural language © ITU, February 09 3 Side 1
2.
Result (example)
Systemdefinition: A computerized system used to prepare and plan an IFIP conference, with emphasis on administration of participants, articles, and the program itself. The system should primarily be an administrative tool, but secondarily serve as a communication medium for the program committee, the organizing committee, and the local administrative personnel to help them manage the conference. The system should be based on a cheap PC with current tools. The system should also be able to function in different types of environments, including use by volunteers who have great enthusiasm and greatly variable administrative experience. © ITU, February 09 4 Describe the Situation Principle: Appreciate the situation (using Rich Pictures) #1 • Expresses different views Tradition vs. change • Focus: – on change or stability Individual info. #2 • Processes such as: – work, production, information processing, exchange, #3 Pool planning, control, development, Standard inf o. organizational change Reorganizing • Structures such as: #4 – production, use, application, Resources Personnel info. communication, deal, ownership, membership, #5 relationship, power • Rich pictures – but not chaotic Plans #6 Coordinating New entity © ITU, February 09 5 Ideas for symbols for Rich Pictures ABC… 123… © ITU, February 09 6 Side 2
3.
Rich Picture (example)
with Focus on Stability reception of calls d isp atcher custome rs ta sks Where is it? When a re they re ad y? 5 0 cars h osp ital emergency vehicle © ITU, February 09 7 Create Ideas • Exemplars (e.g. for a • Experiments with financial system): prototypes: – Study an existing system – Planning – Look at spreadsheets – Development – Examine standard packages – Preparation – Consider SAP – Test – Summarizing • Metaphors (e.g. for a library): – Storage – Supermarket – School © ITU, February 09 8 Different kinds of prototyping • exploratory prototyping: – to clarify requirements – to discuss different solutions • experimental prototyping – determining the adequacy of a proposed solution • evolutionary prototyping – adapting the system to possibly changing requirements © Christiane Floyd © Christiane Floyd © ITU, February 09 9 Side 3
4.
Systems are holistic
views • A system definition expresses a perspective on something The Earth seen from Apollo 17. From a holistic • Every system definition represents a perspective, the universe exists in and specific perception of the real world forms integrated webs of wholeness, often beyond our direct filtered through the ideas, conceptions, perception (Wikipedia) educations and backgrounds of the people involved © ITU, February 09 10 System Definition (FACTOR) Functionality: The system functions that support the application-domain tasks. Application domain: Those parts of an organization that administrate, monitor, or control a problem domain. Conditions: The conditions under which the system will be developed and used. Technology: Both the technology used to develop the system and the technology on which the system will run. Objects: The main objects in the problem domain. Responsibility: The system’s overall responsibility in relation to its context. © ITU, February 09 11 Hair Salon F Support for work planning A system for use in a hair salon in the daily (schedules) and appointments. work of managing customers and appointments, as well as earlier treatments of A Managing customers, their regular customers. treatments, and appointments, and planning employees’ work The system should also be used by the salon schedules. owner for planning employees’ work schedules. Appointments are integrated to help arrange C Development in close collaboration work schedules. with employees. The system should be a reliable and fast tool in T Smaller PC or Macintosh with large the daily work and should also be a common graphical screen. medium for work schedules (appointments). O Customers, employees, The system is based on a single, small (and appointments, and work schedules.. cheap) PC or Macintosh with a large graphical R Tool for reliable administration and screen (17”), capable of showing detailed work a common mediator in the salon. schedules. The development process should be conducted in close cooperation with the salon employees. © ITU, February 09 12 Side 4
5.
Define Systems and
Alternatives • Responsibility 1 • Functionality 1 – Support program design by – Register information about producing overviews and participants and produce a allowing users to add complete participant list. components and save different • Functionality 2 versions. Support conference – Register general participants as operations by emphasizing well as those with an active role potential problems at regular such as author, speaker, or intervals. reviewer. Support the • Responsibility 2 administration of finances and – Automatic conference-planning invitations. Support program. Generate program development of conference from suggested sessions and programs, including incoming paper reviews. registration, paper acceptance, and sessions divisions. © ITU, February 09 13 Evaluation and Choice • Do this as early as possible • Iterate within the activity and in subsequent activities • The purpose is to choose one system • It is the choice of the customer • System developers provide support and organize the process • Approach: question overall decisions and evaluate alternatives © ITU, February 09 14 System Choice: Summary • To agree on the overall system characteristics. Purpose • System definition: A concise description of a Concept computerized system expressed in natural language. • Appreciate the situation. Principles • Cultivate new ideas. • Define alternative systems. • A system definition that fulfills the FACTOR Results criterion. © ITU, February 09 15 Side 5
6.
Task for the
rest of today and until the next OOA&D exercise • Meet in groups and identify a simple system case you can use for your project • Start to work on the system definition! 1. Describe the situation in your case by one or more rich pictures. 1. Create one each, and compare and explain 2. Generate ideas for computerized functions. 3. Make a system definition. 4. Formulate alternatives by varying one or more elements in the system definition (could be different opinions about the characteristics of the system). © ITU, February 09 16 Examples of cases Find your own case - or use the • Video rental (Ex. 13, ch 3) • Mobile Phone (Ex. 14, ch 3) • Teaching Administration (Ex. 15, ch 3) • Elevator Control (Ex. 16, ch 3) .... the idea is to try out the techniques! © ITU, February 09 17 References • L. Mathiassen et al. Object Oriented Analysis and Design. 2000, chapter 16. © ITU, February 09 18 Side 6
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