Strengths	Weaknesses
Minimizes planning overhead since it can be done up front. Structure minimizes wasted effort, so it works well for technically weak or inexperienced staff.	Inflexible Only the final phase produces a non-documentation deliverable. Backing up to address mistakes is difficult.

Pure
Waterfall Summary

The pure waterfall performs well for products
with clearly understood requirements or when working with well
understood technical tools, architectures and infrastructures.
It's weaknesses frequently make it inadvisable when rapid development
is needed. In those cases, modified models may be more effective.

Spiral

The
spiral is a risk-reduction oriented model that breaks a software
project up into mini-projects, each addressing one or more major
risks. After major risks have been addressed, the spiral model terminates
as a waterfall model. Spiral iterations involve six steps:

Determine
objectives, alternatives and constraints.

Identify
and resolve risks.

Evaluate
alternatives.

Develop
the deliverables for that iteration and verify that they are
correct.

Plan
the next iteration.

Commit
to an approach for the next iteration.

Strengths	Weaknesses
Early iterations of the project are the cheapest, enabling the highest risks to be addressed at the lowest total cost. This ensures that as costs increase, risks decrease. Each iteration of the spiral can be tailored to suit the needs of the project.	It is complicated and requires attentive and knowledgeable management to pull it off.

Spiral
Summary

For projects with risky elements, it's beneficial
to run a series of risk-reduction iterations which can be followed
by a waterfall or other non-risk-based lifecycle.

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jGuru: What is a three-tier architecture?

Tags: exam, lifecycle, uml on 2007-12-17 -All Annotations (0) -About

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