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The systems development life cycle (SDLC) is a conceptual model used in project management that describes the stages involved in an information system development project.

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Introduction

Contents What is systems development life cycle (SDLC)? 2 Prototyping 3 Types of Software Prototyping 3 Wireframes/Paper Prototypes 3 Visual Prototypes 4 Wireframes/Paper 4 Interactive Prototypes 4 Benefits of Software Prototyping 4 Disadvantages of Prototyping 5 Insufficient analysis: 5 User confusion of prototype and finished system: 5 Developer attachment to prototype: 6 Excessive development time of the prototype: 6 Expense of implementing prototyping 6 Best projects to use Prototyping 6 When to use 7 Rapid Application Development (RAD) 7 Usage of RAD 10 Dynamic Systems Development Method 12 Critical Success Factors of DSDM 13 DSDM Model Limitations 14 DSDM Model Advantages 14 Waterfall model 15 Requirement Analysis & Definition: 16 System & Software Design: 16 Implementation & Unit Testing: 16 Integration & System Testing: 16 Limitations of the Waterfall Life Cycle Model 17 Advantages 17 Spiral model 18 Advantages 19 Limitation / Disadvantages 19 What is systems development life cycle (SDLC)? The systems development life cycle (SDLC) is a conceptual model used in project management that describes the stages involved in an information system development project. Even though the system is small, it is better to have a proper system development plan, not only because it helps to save the time and the money, but also because it has a proper management and execution of plans and features of the system are well documented. So when regarding a complicated system, to have a system development plan is really effective. SDLC models help in the complete development of a system, right from the conceptual stage to the customer delivery stage. http://upload.wikimedia.org/wikipedia/en/8/84/SDLC.jpg Prototyping The purpose of a prototype is to allow users of the software to evaluate proposals for the design of the eventual product by actually trying them out, rather than having to interpret and evaluate the design based on descriptions. In such a scenario where there is an absence of detailed information regarding the input to the system, the processing needs and the output requirements, the prototyping model may be employed. ...read more.

Middle

degree of traction and a market for third-party code components written to these standards did emerge, even if it was never all that vigorous. Another key element of the Rapid Application Development-life approach was visual programming. According to this concept, it should be possible to construct software with little or no knowledge of programming. The ideal was that programs could be built by non-programmers hooking components together in some kind of workshop-like development application. Again, this ideal was never quite fulfilled, but visual development practices did become a standard part of the typical programmer's toolkit and are now routinely used to develop some parts of software applications, while more traditional coding accounts for the rest. Graphical interfaces, for example, are now constructed visually more often than not, with programmers or user interface designers modifying the desired look of the user interface from within a visual editor and the Rapid Application Development tool then generating the appropriate code to create that look automatically. The automatically-generated code then forms a skeleton framework for the application as a whole which the software developers then build upon and edit by hand. In common use today, the phrase Rapid Application Development has lost most of its original meaning, and even in the ranks of IT professionals, many would be unaware that it once referred to a formal software development methodology. Almost any software tool which is used in the creation of other software will be described in its marketing literature as something that facilitates Rapid Application Development. When used informally in this sense, the phrase Rapid Application Development usually indicates that the tool in question takes some of the burden from the programmer's back by automatically generating part of the program code. Today the software tools used by the majority of programmers to develop new software are called Integrated Development Environments (IDEs). Almost all of them include some Rapid Application Development features. ...read more.

Conclusion

as an operable application, add features in phases, and, at some point, add the final graphics. The spiral model is used most often in large projects. For smaller projects, the concept of agile software development is becoming a viable alternative. The US military has adopted the spiral model for its Future Combat Systems program. The spiral model is mostly used in large projects. For smaller projects, the concept of agile software development is becoming a viable alternative. The US military had adopted the spiral model for its Future Combat Systems program. The FCS project was canceled after six years (2003 - 2009), it had a 2 year iteration (spiral). FCS should have resulted in 3 consecutive prototypes (one prototype per spiral - every 2 years). It was cancelled in May, 2009. The spiral model thus may suit small (up to $3M) software applications and not complicated ($3B) distributed interoperable, system of systems. Also it is reasonable to use the spiral model in projects where business goals are unstable but the architecture must be realized well enough to provide high loading and stress ability. For example, the Spiral Architecture Driven Development is the spiral based SDLC which shows the possible way how to reduce a risk of non effective architecture with the help of spiral model in conjunction with the best practices from other models Advantages Estimates [i.e. schedule, budget etc.] become more realistic as work progresses, because important issues are discovered earlier. Software engineers [who can get restless with protracted design processes] can get their hands in and start working on a project earlier. It is more able to cope with the changes that software development generally entails. Limitation / Disadvantages Risk of not meeting budget or schedule applied differently for each application highly customized limiting re-usability, Risk of not meeting budget or schedule. [FAI09] Faisal Sikder (2009). Software Development Life Cycle (SDLC) Spiral Model http://faisalsikder.wordpress.com/2009/12/18/software-development-life-cyclesdlc-spiral-model/ [BOE86] Boehm B (1986), "A Spiral Model of Software Development and Enhancement", ACM SIGSOFT Software Engineering Notes", "ACM", 11(4):14-24 ?? ?? ?? ?? [C2002] Software engineering LK0407A2282 1 [C2002] Assignment ...read more.

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Whilst this has some very detailed description of systems analysis methods it appears to have been collected from some very high level books or sources without explanation or evaluation.

Marked by teacher Ivor Borkin 25/03/2012

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