Software Models:

A software development procedure, also known as a software development life-cycle (SDLC), is a structure imposed on the development of a software product.

Various models exist to streamline the development procedure. Each one has its advantages and disadvantage, and it is up to the development team to adopt the most suitable one for the project. Sometimes a combination of the models can be more appropriate.

Waterfall Model:

It is the most common and classic of life cycle models, also referred as a linear-sequential life cycle model.  It is extremely simple to understand and use.  In a waterfall model, each of the phases must be completed in it’s wholly before the next phase can starts. At the ending of each phase, a review occurs to determine if the project is on the right path and whether or not to continue or discard the project.

Incremental Model:

It is an intuitive approach to the waterfall model. Multiple development cycles occur here, making the life cycle a “multi-waterfall” cycle. Cycles are divided into smaller, more simply managed iterations. Each of the iteration passes through the design, requirements implementation and testing phases.

A working version of software is developed during the first iteration, so you have working software early on throughout the software life cycle. Subsequent iterations build on the primary software generated during the first iteration.

Spiral Model:

It is same to the incremental model, along with more emphases placed on risk analysis. The spiral model has four phases: Planning, Engineering and Evaluation, Risk Analysis. A software project frequently passes through these phases in iterations (called as Spirals in this model). The baseline spiral, beginning in the planning phase, requirements is collected and risk is assessed.  Each of the subsequent spirals builds on the baseline spiral.

Requirements are gathered throughout the planning phase. In the risk analysis phase, a procedure is undertaken to recognize risk and alternate solutions.  A prototype is generated at the end of the risk analysis phase.

Software is generated in the engineering phase, along testing at the ending of the phase. The evaluation phase let the customer to evaluate the output of the project to date before the project continues to the next spiral.

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