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diff b/w waterfall model & spiral model?
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Answer Posted / dariush
Waterfall Model:
-Series of stages carried out in sequence
-Products of each stage subject to QA inspections
-Only if the products are acceptable is the stage signed off
and the next allowed to start
-Each new stage starts from an agreed baseline established
at preceding stage
-In reality stages will overlap
-No stage is repeated unless a radical change of project scope
-Waterfall may provide a good starting point for structuring
the project
-Can be useful for inexperienced practitioners
Easy to build a simple plan around
Spiral Model:
-When requirements are not well known in advance spiral
model may provide an alternative
-An iterative approach to developing a system
--High level requirement specification is drawn up
--Tested by building a prototype solution
--Prototype is reviewed and requirements are clarified or
changed and amended requirements specification is issued
-The cycle is repeated until requirements are stable and
users approve the deign
-At the beginning of the spiral the focus is on requirements
issues
-At the end concentrates with technical issues
-Iterations can spiral out of control if not tightly managed
--Each iteration will lead to requests for change
--Difficult to call a halt to the process resulting in
projects running late and over budget
-Scope can be difficult to manage
-Final solution can be inadequately documented and poorly
structured
--Prototypes can be viewed as tool for capturing
requirements eliminating design stage
-Can lead to false user expectations
-Early prototypes raise expectations that final solution is
imminent
| Is This Answer Correct ? | 26 Yes | 8 No |
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