It is the longest phase of the Software Development Life Cycle process. In this phase, Developer needs to follow certain predefined coding guidelines. They also need to use programming tools like compiler, interpreters, debugger to generate and implement the code. Once the software is complete, and it is deployed in the testing environment. The testing team starts testing the functionality of the entire system. This is done to verify that the entire application works according to the customer requirement.
The development team fixes the bug and send back to QA for a re-test. This process continues until the software is bug-free, stable, and working according to the business needs of that system.
Once the software testing phase is over and no bugs or errors left in the system then the final deployment process starts.
Based on the feedback given by the project manager, the final software is released and checked for deployment issues if any. Once the system is deployed, and customers start using the developed system, following 3 activities occur. The main focus of this SDLC phase is to ensure that needs continue to be met and that the system continues to perform as per the specification mentioned in the first phase. The waterfall is a widely accepted SDLC model. In this approach, the whole process of the software development is divided into various phases of SDLC.
In this SDLC model, the outcome of one phase acts as the input for the next phase. This SDLC model is documentation-intensive, with earlier phases documenting what need be performed in the subsequent phases. The incremental model is not a separate model. It is essentially a series of waterfall cycles.
The requirements are divided into groups at the start of the project. These methods vary widely in approach, yet they share a common goal: to develop software as cheaply , efficiently , and effectively as possible. Software is a complex product that is developed and delivered through a series of steps.
That is the one thing all the various methods have in common: one way or another, software, like all products, starts as an idea. The idea then becomes a document, or perhaps a prototype, depending on the method in use.
Whether a document, diagram, or working software, the artifact created in one step becomes the input to the next step. Eventually, the software is delivered to the customer. The process of software development is a never-ending cycle. Reports from error monitoring software about usability and bugs feed back into the process of software development, and become new feature requests and improvements to existing features. This is why the Software Development Life Cycle is the most general term for software development methods.
The steps of the process and their order vary by method. Regardless of method, they typically run in cycles, starting over with each iteration. Each software development methodology several will be detailed below is a plan framework for how to develop software. There is much debate about which method is best overall, which is best suited to a particular type of software, and how to measure success in software development.
One thing, however, is certain: any plan is better than no plan. Project managers have no idea how much progress is made towards completion of a project. A formally defined method for software development in the form of the SDLC achieves a number of benefits:. These steps are very roughly the same from one methodology to another. They tend to occur in this order, though they can also be mixed together, such that several steps occur in parallel.
Waterfall methods tend to take each of these steps in turn. Outputs from one become inputs to the following step. The outputs of the planning phase include: project plans, schedules, cost estimations, and procurement requirements. Ideally, Project Managers and Development staff collaborate with Operations and Security teams to ensure all perspectives are represented.
The business must communicate with IT teams to convey their requirements for new development and enhancement. Architects, Development teams, and Product Managers work with the SMEs to document the business processes that need to be automated through software.
The output of this phase in a Waterfall project is usually a document that lists these requirements. Agile methods, by contrast, may produce a backlog of tasks to be performed. Once the requirements are understood, software architects and developers can begin to design the software. This means understanding the impacts of requirements on the IT infrastructure, staffing, vendors, support capabilities, security, networking and so on.
Service Architecture: In terms of architecture, to optimize a service means there must be recognition that a system of inter-connected components are being assembled to deliver the services needed by the business.
Service architects need to plan how all the various configuration items CI connect together. Dependencies need to be identified and any issues identified and dealt with. All too often only the application requirements are the focus, at the expense of the overall organization. Selecting an open source tool that causes the project to be within budget, but results in far higher support costs and unacceptable total costs because it is non-standard, is one common example.
Service Testing: The development of test plans also highlights the need for a services mindset. In order to understand how a service will perform in production requires testing in a manner that reflects how the service will be delivered.
There are recognized testing regimens such as integration, load and operational testing that can help test the overall service provided the test service adequately mirrors the production service. Differences in database sizes, network speeds, levels of integration, network security systems and so on can cause there to be different behaviors in the test environment vs. The intent is to come up with procedures that reduce the risks of introducing a deficient service into production to a tolerable level.
Organizations need to evolve their development lifecycle from a software-only approach to one that recognizes that overall services need to be architected, built, tested and implemented accordingly to optimize results. George Spafford is a principal consultant with Pepperweed Consulting and a long-time IT professional. Webopedia is an online information technology and computer science resource for IT professionals, students, and educators.
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Planning for the quality assurance requirements and identification of the risks associated with the project is also done in the planning stage. The outcome of the technical feasibility study is to define the various technical approaches that can be followed to implement the project successfully with minimum risks. Once the requirement analysis is done the next step is to clearly define and document the product requirements and get them approved from the customer or the market analysts.
This is done through an SRS Software Requirement Specification document which consists of all the product requirements to be designed and developed during the project life cycle.
SRS is the reference for product architects to come out with the best architecture for the product to be developed. Based on the requirements specified in SRS, usually more than one design approach for the product architecture is proposed and documented in a DDS - Design Document Specification. This DDS is reviewed by all the important stakeholders and based on various parameters as risk assessment, product robustness, design modularity, budget and time constraints, the best design approach is selected for the product.
A design approach clearly defines all the architectural modules of the product along with its communication and data flow representation with the external and third party modules if any. The internal design of all the modules of the proposed architecture should be clearly defined with the minutest of the details in DDS.
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