1 / 20

SDLC

SDLC. Software Development Life Cycle. SDLC. Acronym for s ystem d evelopment l ife c ycle . Is the process of developing information systems through: Investigation Analysis Design Implementation Maintenance . SDLC. Also known as: information systems development or

blue
Download Presentation

SDLC

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. SDLC Software Development Life Cycle

  2. SDLC • Acronym for system development life cycle. • Is the process of developing information systems through: • Investigation • Analysis • Design • Implementation • Maintenance

  3. SDLC • Also known as: • information systems development or • application development • Is a systems approach to problem solving • Is made up of several phases, each comprised of multiple steps ….

  4. The Software Concept • Identifies and defines a need for the new system • The existing system is evaluated • Deficiencies are identified • This can be done by: • Interviewing users of the system • Consulting with support personnel

  5. A Requirements Analysis • Analyses the information needs of the end users • The new system requirements are defined • The deficiencies in the existing system must be addressed with specific proposals for improvement

  6. The Architectural Design • Creates a blueprint for the design with the necessary specifications for: • the hardware • the software • the people • the data resources • the security issues • the physical construction

  7. Coding and Debugging • Creates and programs the final system • The new components and programs must be obtained and installed

  8. System Testing • Evaluates the system's actual functionality in relation to expected or intended functionality • Users of the system must be trained in its use • All aspects of performance must be tested • If necessary, adjustments must be made at this stage

  9. System Put to Use • Can be done in various ways: • The new system can be phased in, according to application or location, and the old system gradually replaced • In some cases, it may be more cost-effective to shut down the old system and implement the new system all at once

  10. System Evaluation • Once the new system is up and running for a while, it should be exhaustively evaluated • Maintenance must be kept up rigorously at all times • Users of the system should be kept up-to-date concerning the latest modifications and procedures

  11. Various SDLC Approaches • The waterfall model, the original SDLC method • Rapid Application Development (RAD) • Joint Application Development (JAD) • The fountain model • The spiral model • Build and fix • Synchronize-and-stabilize • Frequently, several models are combined into some sort of hybrid process

  12. Documentation • Is crucial regardless of the type of model chosen or devised for any application • Is usually done in parallel with the development process.

  13. Waterfall Model • Linear and sequential • Distinct goals for each phase of development • Development moves from concept, through design, implementation, testing, installation, troubleshooting, and ends up at operation and maintenance with no overlapping or going over previous steps

  14. Waterfall Model • Does not allow for much reflection or revision • Once an application is in the testing stage, it is very difficult to go back and change something that was not well-thought out in the concept stage

  15. Joint Application Development • A methodology that involves the client or end user in the design and development of an application, through a succession of collaborative workshops called JAD sessions • Is thought to lead to faster development times and greater client satisfaction, because the client is involved throughout the development process

  16. Rapid Application Development • A concept that products can be developedfaster and of higher quality through: • Gathering requirements using workshops or focus groups • Prototyping and early, reiterative user testing of designs • The re-use of software components • A rigidly paced schedule that defers design improvements to the next product version • Less formality in reviews and other team communication • Is a variation of JAD

  17. Build • A build is a version of a program • As a rule, a build is a pre-release version and as such is identified by a build number, rather than by a release number • Reiterative (repeated) builds are an important part of the development process

  18. Build • Throughout development, application components are collected and repeatedly compiled for testing purposes, to ensure a reliable final product • Build tools, such as Make or Ant, enable developers to automate some programming tasks • As a verb, to build can mean either to write code or to put individual coded components of a program together

  19. Synchronise and Stabilise • Is a systems development life cycle model in which teams work in parallel on individual application modules • They frequently synchronise their code with that of other teams • They debug (stabilise) code regularly throughout the development process.

  20. Synchronise and Stabilise • The sync-and-stabilize model offers advantages over the older waterfall model, which is strictly sequential in nature • Sync-and-stabilize development allows for changes at any point in the process • It can be flexible, and more easily able to respond to market requirement changes

More Related