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Systems Analysis and Development Approaches

The waterfall model

  • 3 things to know
  • AS Unit 1

Overview

Waterfall model of systems development, stages of the waterfall model in order and produced at the end of each waterfall stage.

What you need to know

Answer each one before you reveal it.

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Key term

Why does the waterfall model suit a fixed-price contract?

Key term

Describe the waterfall model of systems development.

Process

Name the stages of the waterfall model in order.

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    Describe the waterfall model of systems development.

    Model answer

    The waterfall model runs the development stages in a fixed sequence, each stage being completed and signed off before the next begins, so the project flows steadily downwards from analysis to maintenance.

  2. 2

    Name the stages of the waterfall model in order.

    Model answer

    The waterfall model runs feasibility, analysis, design, coding, testing, implementation and maintenance in that order.

  3. 3

    Why is the waterfall model given that name?

    Model answer

    Each completed stage feeds into the one below it like water falling from one step to the next, and the work does not naturally flow back upstream.

  4. 4

    What is produced at the end of each waterfall stage?

    Model answer

    Each stage of the waterfall model ends with an agreed document, such as the requirements specification or the design specification, and that document is signed off before the next stage starts.

  5. 5

    Give two advantages of the waterfall model.

    Model answer

    The waterfall model produces full documentation at every stage, and its clear milestones make progress and spending easy to measure and control.

  6. 6

    Give two disadvantages of the waterfall model.

    Model answer

    Users see no working software until late in the project, and a requirement misunderstood at the start may not come to light until testing, when correcting it is expensive.

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