The Systems Development Life Cycle (SDLC) provides a structure for the challenges of transitioning from the beginning to the end of the project for the prevention of forgetting a step.
There are several different SDLC methodologies which are used nowadays to guide professionals throughout their project-based work.
This article represents some important factors of the 6 following SDLC methodologies.
1. Waterfall Model
Waterfall is considered as the oldest and the most straightforward of the structured in SDLC methodologies — finish one phase, then move on to the next. Each stage is based on information from the previous stage and possesses its own project plan. Waterfall is easy for users to understand and to manage.
However, early delays can ruin the entire timeline of the project. Since there is little space for revisions once a stage is completed, problems are hard to be fixed until you get to the maintenance stage. This model will not work well if it exists flexibility or if the project is long term and ongoing.
2. V-Shaped Model
The V-shaped model which is also known as the Verification or Validation model, grew out of Waterfall and is characterized by a corresponding testing phase for each development stage. As considered about Waterfall, each stage in V-shape begins only after the previous one has ended.
This model is helpful only when there are no any unknown requirements, as it still has difficulty in going back and making changes.
3. Iterative Model
The Iterative model is repetition incarnate. Instead of beginning with fully known requirements, you can implement a set of software requirements, then test, evaluate and pinpoint further requirements. A new version of the software is produced with each phase, or iteration. Rinse and repeat until the complete system is ready.
One advantage over other SDLC methodologies: This model gives you a working version early in the process and makes it less expensive to implement changes. One disadvantage: Resources can quickly be eaten up by repeating the process again and again.
4. Spiral Model
One of the most flexible SDLC methodologies, the Spiral model takes a cue from the Iterative model and its repetition; the project passes through four phases over and over in a “spiral” until completed, allowing for multiple rounds of refinement.
This model allows for the building of a highly customized product, and user feedback can be incorporated from early on in the project. But the risk you run is creating a never-ending spiral for a project that goes on and on.
5. Big Bang Model
A bit of an anomaly among SDLC methodologies, the Big Bang model follows no specific process, and very little time is spent on planning. The majority of resources are thrown toward development, and even the client may not have a solid grasp of the requirements. This is one of the SDLC methodologies typically used for small projects with only one or two software engineers.
Big Bang is not recommended for large or complex projects, as it’s a high-risk model; if the requirements are misunderstood in the beginning, you could get to the end and realize the project may have to be started all over again.
6. Agile Model
By breaking the product into cycles, the Agile model quickly delivers a working product and is considered a very realistic development approach. The model produces ongoing releases, each with small, incremental changes from the previous release. At each iteration, the product is tested.
This model emphasizes interaction, as the customers, developers and testers work together throughout the project. But since this model depends heavily on customer interaction, the project can head the wrong way if the customer is not clear on the direction he or she wants to go.
Which SDLC methodology is suitable for each of you?
Every SDLC methodology offers unique process for the variety of project challenges you will encounter in your career.
Finding the right one depends heavily on not just the expected outcome, but the parameters by which the project is executed.
Souce: App Developer Magazine
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