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1 MSc. NguyễnThị Thu Trang, Department of Software Engineering [1] ISO/IEC FDIS 12207, Systems and software engineering Software life cycle processes. [2] Hoffer J. A. Modern System Analysis and Design. Third Edition. Addison Wesley, 2004 [3] Sommerville, I.: Software Engineering, 7th ed. Reading, Massachusetts: Addison Wesley, [4] Guide to the Software Engineering Body of Knowledge 2004 Version. SWEBOK. IEEE project. [5] Business Application System (BA System) 2. Software Life Cycle Process 3. Software Implementation Process 4. Software Development Process Model 1. Business Application System (BA System) 2. Software Life Cycle Process 3. Software Implementation Process 4. Software Development Process Model 3 4 1

2 Whole system to accomplish the business Example: Personnel System, Payment System In this course, Computerized BA System is treated. The BA System includes: hardware, networks, software*, and manual operations software*: Includes platform software (OS ), middle software, and Business Application Software Hardware Business Application System IT System Network BA Software Manual operations Equipments 5 6 In general, Life Cycle means from birth until death For a BA system, the Life Cycle means from the conception to the retirement: 1. System Planning (conception) 2. System Development: Includes development of a BA software 3. System Operation 4. System Maintenance Disposal (retirement) as the end of maintenance Analysis and Design of a BA System Define stake holder's requirements Envisage the design of the system structure with system components such as hardware, software, network, manual operations... Detail design of each system component * Development of a BA Software as a component of the System Software Requirement Analysis, Software Architectural Design process 7 8 2

3 Integration and Construction of BA System System Integration process/system Qualification Testing process Integrate the components including the BA Software into the system System Qualification Testing If the test is successful completion, developers can start to prepare the software deliverables Preparation of BA System Operation Software Installation Process: The software is installed in the target environment Software Acceptance Process: Acceptance review and testing of the software product Depending on the contract, software developers have to assist the activities Operation & Maintenance of BA System Software Operation Process, Software Maintenance Process: System and Software maintenance starts at the same time as operation Depending on the contract, software developers have to assist the activities 9 10 The customer s business success depends on the system development success. Business Application Software is one of the major components of the Business Application System. What are the main factors for the system development success? The Software to be developed meets to functional requirements? To keep appointed date of delivery? Meets the required quality such as Reliability, Usability, Performance, Maintainability? Necessary to provide maintenance activity during the system operation period? 1. Business Application System (BA System) 2. Software Life Cycle Process 3. Software Implementation Process 4. Software Development Process Model

4 ISO/IEC 12207:2008, Systems and software engineering Software life cycle processes - latest and International Standard Software Development/Implementation l t ti Process. The life cycle begins with an idea or a need that can be satisfied wholly or partly by software and ends with the retirement of the software. Standard implementation works are clarified and defined hierarchically as processes PROCESS ACTIVITY 1 TASK 1.1 ACTIVITY N TASK N.1 In ISO, all industry standards, including Information Technology, are developed. ISO: International Organization for Standard In the field of Information Technology, in ISO/IEC JTC1, international standards are developed. IEC: International Electro-technical Commission JTC1: Joint Technical Committee ISO/IEC JTC1 has 32 principal member bodies which develop the international standards, and 44 observer member bodies. TASK 1.N TASK N.N Standards are important, especially in IT Provide a common understanding such as frameworks, and terminologies/definitions in international transactions TBT Agreement of WTO recommends the use of ISO Standards for governmental purchase in affiliate countries WTO: World Trade Organization Vietnam became 150 th member of WTO in January 2007 TBT Agreement: Agreement on Technical Barriers to Trade Certifications can be got based on some standards This International Standard groups the activities that may be performed during the life cycle of a software system into seven process groups [1]*: Agreement Processes: 2 processes Organizational Project Enabling Processes: 5 processes Project Processes: 7 processes Technical Processes: 11 processes Software Implementation Processes: 6 processes Purpose: to produce a specified system element implemented as a software product or service [1]**. Software Support Processes: 8 processes Software Reuse Processes: 3 processes 15 [1]*: clause 5.2.1; pp. 13, [1]**: clause ; pp. 57, 16 4

5 1. Business Application System (BA System) 2. Software Life Cycle Process 3. Software Implementation Process 4. Software Development Process Model System Requirements Analysis Process and System Architectural Design Process are achieved just before Software Implementation Process. Software Implementation Process includes the following lower level processes: Software Requirements Analysis Process Software Architecture Design Process Software Detailed Design Process Software Construction Process Software Integration Process Software Qualification Testing Process Purpose: to establish the requirements of the software elements of the system [1] Items written on the brief requirement description should be analyzed and defined: System environmental conditions under which the software is to perform. The functional requirements and the interface requirements. Data definition and database requirements. Some non functional requirement items such as reliability, usability, time efficiency Qualification requirements: The requirements are used as criteria or conditions to qualify a software product as complying with its specifications. Software implementer should analyze and make an internal review [1] Consistency and traceability to requirements and design Testability Feasibility of software design, operation and maintenance Software implementer should conduct the common review with ordering party and confirm the result of Requirements analysis and the software development plan Following a successful evaluation and review, the software requirements should be approved, baselined and communicated to all affected parties. Subsequent changes to the software requirements baseline should be evaluated for cost, schedule and technical impact. [1]: Session ; pp [1]: Session ; pp

6 Purpose: to provide a design for the software that t implements and can be verified against the requirements [1] In this process, a software architecture is designed from the software requirements. In the software architecture, the following items are defined: a top level l structure t of the software and the software components which constructs the software a top level design for the interfaces external to the software and between software components a top level design for the database [1]: Session ; pp All the requirements for the software must be allocated to its software components and further refined to facilitate detailed design The implementer should evaluate the architecture of the software and the interface and database designs considering internal external consistency and feasibility of detailed design, operation, and maintenance. 22 Purpose: to provide a design for the software that implements and can be verified against the requirements and the software architecture and is sufficiently detailed to permit coding and testing [1] Develop a detail design for each software component each component is refined into software units that can be coded, compiled, and tested all the software requirements are allocated from the software components to software units the interfaces external to the software item and between the software units The detailed design of the interfaces must permit coding without the need for further information [1]: Session ; pp Purpose: to produce executable software units that t properly reflect the software design [] [1] The following items are developed: Each software unit and database Test procedure and test data for software unit and database Unit tests and database test are also carried out. The implementer shall evaluate software code and test results considering internal external consistency, test coverage of units and traceability to the requirements and design of the software. [1]: Session ; pp

7 Purpose: to combine the software units and software components, producing the integrated software item, consistent with the software design, that demonstrate that the functional and non functional software requirements are satisfied on an equivalent or complete operational platform [1] The following items/tasks are developed/performed: An integration plan Integration of the software units and software components into the software Program/software test Test requirements, test procedure, and test cases/data for Software Qualification Testing [1]: Session ; pp Purpose: to confirm that the integrated software product meets its defined requirements [1]. Qualification testing in accordance with the qualification requirements for the software item The implementer supports audits to conform the software meets to the qualification requirements. If it is successful completion of the audits, the implementer prepare the deliverable software product for System Construction process. [1]: Session ; pp System Construction Process Performed after the Software Implementation Process Software developers may assist the following processes depending on the contract System Integration Process System Qualification Testing Software Installation Process Software Acceptance Support Process Software Life Cycle Process SLCP is the international standard processes focused on the development and support of BA Software. SLCP can be used as a common language among the stakeholders such as acquirers and suppliers. They can communicate or order the software development using SLCP. E.g. we can say To order the software detailed design process or later software implementation processes of new library system

8 1. Business Application System (BA System) 2. Software Life Cycle Process 3. Software Implementation Process 4. Software Development Process Models The framework activities will always be applied on every project... BUT The tasks (and degree of rigor) for each activity will vary based on: the type of project (an entry point to the model) characteristics ti of the project common sense judgment; concurrence of the project team 29 System/information engineering analysis design code test Difficulty of accommodating change after the process is underway 8

9 business data process application generation testing & turnover 2/25/2012 Inflexible partitioning of the project into distinct stages makes it difficult to respond to changing customer requirements. Therefore, this model is only appropriate when the requirements are well understood and changes will be fairly limited during the design process. Few business systems have stable requirements. The waterfall model is mostly used for large systems engineering projects where a system is developed at several sites. listen to customer customer test-drives mock-up Prototyping build/revise mock-up team #1 business business data team #2 data process team # days process application generation application generation testing & turnover testing & turnover RAD System/information engineering increment 1 analysis design code test delivery of 1st increment increment 2 analysis design code test delivery of 2nd increment increment 3 analysis design code test delivery of 3rd increment increment 4 analysis design code test delivery of 4th increment Customer value can be delivered with each increment so system functionality is available earlier. Early increments act as a prototype to help elicit requirements for later increments. Lower risk of overall project failure. The highest priority system services tend to receive the most testing. calendar time 9

10 Pla nning Risk Analysis Customer Communication Customer Evalua tion Construction & Release Eng ineering Inception Establish the business case for the system. Elaboration Develop an understanding of the problem domain and the system architecture. Construction System design, programming and testing. Transition Deploy the system in its operating environment. An iteration is a distinct sequence of activities based on an established plan and evaluation criteria, resulting in an executable release (internal or external) 10

11 1. Describe & give your opinion about software development process models with their advantages/disadvantages 2. Specify KPAs of Requirement Engineering & draw a diagram showing relationships between them (in SWEBOK Guide to the Software Engineering Body of Knowledge 2004 Version). 11

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