SDLC (Linear and Evolutionary)

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Difference between Linear and Evolutionary

*Linear:* Step-by-step approach (Waterfall). Each step must be completed, understood and agreed before the next step can be started. *Evolutionary:* The system evolves through early prototyping and progressive versions of the system (Iterative).

What does SDLC contain of:

*Two approaches:-* Evolutionary Linear *Five basic life cycles:-* Waterfall Incremental "V" model Iterative Spiral

The stages of a SDLC *FRDDTI*

1. Feasibility study 2. Requirements engineering 3. Design 4. Development 5. Testing 6. Implementation

The linear life cycles include: WIV

1. Waterfall 2. Incremental 3. "V" model

The five SDLC's are? WIVIS

1. Waterfall 2. Incremental 3. "V" model 4. Iterative 5. Spiral

The evolutionary life cycles: IS

4. Iterative 5. Spiral

Iterative development

A minimum of 3 iterations would typically be required to achieve an external release.

What is a Systems development lifecycle? *PBT&D*

A systems development life cycle is a *"Framework"* Describes the stages we follow to plan, design, build, test and deliver information systems.

3rd Iteration:

Consolidate

1st Iteration:

Investigate

What is Iterative?

It is a life cycle where the overall project is composed of several small time- boxed developments, called iterations which take place in sequence. They can look a bit like mini-linear projects.

2nd Iteration:

Refine

What is the "V" model?

The "V" model is an extension to the waterfall model to deal with problems that occurred during a waterfall life cycle. The problems include running out of time and money.

What is an incremental model?

The incremental model is implemented and incremented (a little more is added each time) until the product is finished.

What is spiral?

The spiral life cycle does not need requirements to be defined in advance. The project has 4 phases called spirals, which are concepts that need to be repeatedly revisited until a working product is complete.

What is the waterfall model?

The waterfall model illustrates the software development process in a linear sequential flow.

What is scope creep?

Uncontrolled changes in a project scope. Can occur if the scope of a project is not properly defined, documented or controlled. It is considered harmful.


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