5 main types of software development life cycle methodologies. Advantages and disadvantages of different SDLC models.
May 18 2021
One of the fundamental notions of SDLC is the model. An SDLC model serves as the basis of development and should be adapted to the team, project, and product requirements. There are different models, each of them having its strengths and weaknesses. In this article, we will get acquainted with the main types of SDLC models, their specifics, positive and negative sides.
The process when you plan, create, test, and launch the software is called the Software Development Life Cycle. Basically, it is a development plan that consists of various stages. First of all, let’s have a quick look at the main stages of the software development lifecycle:
If you want to get more information about the main stages of custom software development, read this article.
The waterfall model is the earliest and the simplest of all the SDLC methodologies. The whole software development process is separated into phases, each phase beginning only when the previous one is completed. Every stage has its own project plan and relies on the information from the previous stage. The main SDLC stages of this model include gathering and analyzing the requirements, system design, implementation, testing, deployment, and launch. Such a model is widely used in software development as it is simple to plan and manage. The process is also strictly documented and the processes and outcomes of each stage are clearly predefined.
Each project is individual and the chosen SDLC model needs to correspond to the various inner and outer requirements. The waterfall model will be most suitable when:
Advantages of the waterfall model:
This software development life cycle model is considered a very practical one. It divides the project into cycles with short time limits which enables the quick delivery of a running product. At the end of each cycle, the product is tested. This SDLC methodology is the most widely used alternative of the waterfall one. Being a cycle model, it enhances the interactions between different development team members. It is also highly dependent on the interactions between the development company and the customer. The agile model is based on the adaptive approach that doesn’t require thorough planning. The developers adjust the process to the changing product requirements.
The Agile model is getting more and more popular because of its adjustability and adaptivity. It is appropriate in such cases:
Advantages of the Agile model
Disadvantages of the Agile model
V-shaped SDLC model is an extended waterfall model, in which the testing (verification) and development (validation) stages go parallelly, the testing stages correspond to certain development stages. This model has a strict plan and like in a waterfall model, the next stage doesn’t begin until the previous one is finished. According to this model, testing is done hierarchically and every stage has a certain deliverable. Errors are easy to detect at the early stages.
This model emphasizes the testing activities and enhances the probability of delivering a high-quality and error-free product. V models is the best pick when:
Advantages of V-shaped model
Disadvantages of V-shaped model
According to the spiral model, the software development life cycle is divided into repetitive architecture and prototyping stages. The main problem of this SDLC model is to find the right moment to move on to the following stage. Every stage encompasses such phases as: planning, risk analysis, engineering and testing, and evaluation. These stages are repeated multiple times until the product is ready. For now, it is one of the most flexible methodologies that gives developers much freedom to create a highly personalized product. Shifting to the next stage is done even if work on the previous one is not completed.
This model is popular for software development because of its enhanced risk reduction and Here are the cases when the spiral model is the most appropriate:
Advantages of the Spiral model
Disadvantages of the Spiral Model
This model is something out-of-the-box in software development. Its highlight is that there isn’t any specific process developers have to follow. There is the only stage - bang, which means starting the project immediately. Even the customer requirements are not clearly defined according to this model. As a rule, there are one or two developers working on the project. It may seem chaotic, but it works for small projects by saving time, energy, and cost on the initial stages.
This model is highly flexible and gives developers an opportunity to start working on a project right away. In these cases, the use of the Big Bang model will be the most beneficial.
Advantages of the Big Bang Model
Disadvantages of the Big Bang Model
Now that you know the main SDLC models, let’s talk about choosing the most suitable one for your development project. Here are the main criteria to take into account:
During the evolution of SDLC, different models emerged from the basic waterfall methodology to meet various requirements and expectations. There is no all-purpose model that works well for all projects, conditions, and cost requirements. Each model has a unique set of actions that ensure the development process’s success. We hope this article sheds more light on various SDLC models available.
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