Engagement Model


One of the basic notions of the software development process is SDLC models which stand for Software Development Life Cycle models. SDLC – is a continuous process, which starts from the moment, when it’s made a decision to launch the project, and it ends at the moment of its full remove from the exploitation.

The most used, popular and important SDLC models are given below:

  • Waterfall Model
  • Iterative Model
  • Agile Model

Waterfall SDLC Model

Waterfall – is a cascade SDLC model, in which development process looks like the flow, moving step by step through the phases of analysis, projecting, realization, testing, implementation, and support. This SDLC model includes gradual execution of every stage completely.

And if you take one of the SDLC models mentioned below as the basis – in any case, it should be adjusted to the features of the product, project, and company. This process is strictly documented and predefined with features expected to every phase of this software development life cycle model.

Iterative SLDC Model

The Iterative Software Development Life Cycle process may start with the requirements to the functional part, which can be expanded later. Speaking with math terminology, the process is repetitive, allowing making new versions of the product for every cycle.

Every iteration includes the development of a separate component of the system, and after that, this component is added to the functional developed earlier. The iterative model is a realization of the sequential approximation method; that means a gradual closeness to the planned final product shape.

Agile SDLC Model

In the agile methodology after every development iteration, the customer is able to see the result and understand if he is satisfied with it or he is not. This is one of the advantages of the agile software development life cycle model, it requires only initial planning to start the project.

One of its disadvantages is that with the absence of defined requirements it is difficult to estimate the resources and development cost. Extreme programming is one of the practical use of the agile model. The basis of such a model consists of short weekly meetings which are the part of the Scrum approach.

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