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The systems development life cycle
The traditional the system development life cycle
The system development life cycle essay
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The system development life cycle, also know as the SDLC, is the process of designing and developing a system or software to meet certain requirements. (“System development life,”). This cycle involves many different phases, in which the system is planned, analyzed, designed, implemented, and tested. There are five major phases in the system development life cycle: systems planning, systems analysis, systems design, systems implementation, and systems security and support. Each of these phases has a particular responsibility and certain tasks are perfumed in each phase. The systems planning phase is the first phase completed in the SDLC. It encompasses evaluating the feasibility and the cost of the system, identifying the risks involved with implementing the system, and determining the responsibilities of each of the team members. To begin the planning phase, a systems request is submitted to the IT department, detailing the problems and changes to be made in a system. (Rosenblatt, 2014). It is important to note that the request may be a large, significant request, or it can be a smaller, more minor request; however, each request should be addressed using the systems development life cycle. After the request has been made, a feasibility study is conducted that determines the costs and benefits of the new or improved system. The study then recommends a strategy that is best for the system in terms of technical, monetary, and time factors. After the systems planning is complete, the next course of action is the systems analysis phase. This phase includes defining the requirements of the system. This means that the team must conclude what the system needs to do in order to satisfy the users. This is done by forming a requirements... ... middle of paper ... ... and increases the cost to benefit ratio. Although there are many different methods that apply the five phases of the SDLC, information technology professionals must be able to decide which method to use for a particular system so that it will maximize the benefits and create a system that meets user expectations in the most logical manner. Works Cited System development life cycle (sdlc) methodologies. (n.d.). Retrieved from http://www.slepi.net/blog/system-development/system-development-life-cycle-sdlc-methodologies.html Morris, K. (n.d.). Steps in the system development life cycle. Retrieved from http://smallbusiness.chron.com/steps-system-development-life-cycle-43241.html Rosenblatt, H. (2014). Systems analysis and design. (10th ed.). Boston, MA: Course Technology. Sdlc rad model. (n.d.). Retrieved from http://www.tutorialspoint.com/sdlc/sdlc_rad_model.htm
Controlled Requirement Expression (CORE) was developed for the British Aerospace programs while the UK Ministry of Defence was carrying out a requirement analysis (Hull et al., 2010). The fundamental component of the CORE methodology is viewpoints as different users see systems in different ways. There are many different stakeholders involved in a system; using CORE methodology involves finding all the different viewpoints of those stakeholders that have an interest in the system whether it’s a person, role or organisation ext.… (Sommerville and Sawyer, 2000). By organising viewpoints hierarchy it assists experts to read the scope and supports the analysis process. CORE Methodology is extensively used for real time system requirements specification.
It is a step of defining the goals of the projects and the results are aimed at reaching certain levels of productivity of customer satisfaction. The second stage is measure, and it is the stage of collecting data and facts and evaluating current operational performance. The third stage is analyze with the purpose of developing methods and theories that will best suit the solving of the problem; it is also a stage of detecting cause-and-effect ties of the processes. The fourth stage is improve, it is aimed at generating ideas for reaching the desired process improvement. Finally, there is the control stage that is about monitoring the operations to find out whether the process of improvement is smooth and the problems were solved (Meredith & Shafer,
...takes to set up information in the system. The level of understanding would improve through partaking or getting involved and henceforth could be adapted easily. All the bits and pieces of the project would rapidly increase or grow as per the workflow process. At the end, the overall CPOE system should be able to compare the manual method with the new electronic system and tell which is best and accurate to use and also tell how much time and money will be saved when using either system. At the end of the project the team should be able to come together and discuss whether or not the project met all of the company’s needs such as if it is reliable, efficient, safe and secure and also does it save time and money. Then, if the system has more advantages than disadvantages and it is worth all of the team’s time and effort it would be best to continue with the project.
Rechtin, E. Systems Architecting: Creating and Building Complex Systems. Prentice-Hall, 1991. Web 16 March 2012
The Systems Development Life Cycle (SDLC) consists of phases used in developing a piece of software. It is the plan of how to develop and maintain software, and when necessary, replace that software. In 2007 during my hospital’s transition to a new software system, I was fortunate enough to be included in the process. I did not get involved until the implementation phase, but from then on, until now, I remain very active in the process. I decided to highlight the Waterfall Model of SDLC. The Waterfall Model is a “sequential development process” with each phase continuing in a line (McGonigle and Mastrian, 2012, p. 205).
Given the time, it takes to develop large sophisticated software systems it not possible to define the problem and build the solution in a single step. Requirements will often change throughout a projects development, due to architectural constraints, customer’s needs or a greater understanding of the original problem. Iteration allows greater understanding of a project through successive refinements and addresses a projects highest risk items at every stage of its lifecycle. Ideally each iteration ends up with an executable release – this helps reduce a projects risk profile, allows greater customer feedback and help developers stay focused.
The System Development Life Cycle (SDLC) plan includes six phases. These six phases are The Preliminary Investigation Phase, The Analysis Phase, The Design Phase, The Implementation Phase, and The Maintenance Phase. (1) If this plan had been followed there would have probably been much different results.
Williams, (1997) identified four steps to system planning. Earl (1989) proposed five alternate strategy frameworks which project managers should consider when deciding how the system will enhance the business function. Standard business strategy methods are used to identify such opportunities by using: value chains, application searching and information analysis (Earl 1989).
With the purpose in mind, the requirements for the project should be set. Often, the users will need to be contacted to clarify the requirements from their initial project request. The requirements should be in business terms, relate to organizational requirements, and be broken down by functional area. For example:
The team implementing the new system were required to do both functional and systematic requirements thus affecting the implementation of the new system
which parts of the tasks. The author claims that with this approach higher-quality requirements are produced and are faster to produce and easy to verify and validate. This follows a similar phenomena as the definition of use case by Alistair Cockburn , ie use case is what the system does and how it interacts with the user. But tasked based requirement analysis delay splitting the work between the system and the user. In this approach it is considered as a decision to be made later.
Within the analysis phase a set of goals are needed within the domain. From this there are three perspectives which are taken; the object model the Ronald LeRoi Burback (1998) states “dynamic model, and a functional model. The object model represents the artifacts of the system. The dynamic model represents the interaction between these artifacts represented as events, states, and transitions. The functional model represents the methods of the system from the perspective of data flow.” After the analysis phase the system design phase takes place. Here the system is sub-categorized and appointed tasks and persistent data storage is established, also within this phase the architecture is formed. Lastly the object design phase starts and is where the implementation plan is established and algorithms and object classes are also
Computer Technology: The primary agenda of the first chapter is to become familiar with computer technology and why technical knowledge is important. Information Systems is developed by Software development life cycle (SDLC) which is also called as Software Development Process. It is basically a framework which specifies the task performed at each step in a software development process. SDLC is used by Information System’s Engineer’s to build Information Systems. The activi...
Requirements engineering begins during the communication activity, continues into the modeling activity, and builds a bridge from the system requirements into software design and construction. Through requirements engineering, there is an examination of the context of software work performed. It is essential for the software engineering team to understand all requirements of a problem before the team tries to solve the problem. An identification of specific needs that the design and construction must address is also included. Further is a need for the identification of the priorities that guides the order for the completion of work. This i...
Systems development methodology is a framework that is used to develop and control the systems development process. There are many different methodologies for information systems development. The most widely used methodologies is the Systems Development Life Cycle(SDLC).