Spiral SDLC Main Highlights 2004 Dr. Ernest Cachia Slide 2 Main
characteristics Placeholder (framework or meta-model) for other,
less elaborate, development models Iterative Prototype-oriented
Starts with planning and ends with customer evaluation Low risk
Slide 3 Basic concepts of Spiral Development Diagram from Tad
Gonsalves, Sophia University, Tokyo, Japan. Slide 4 Spiral areas
Planning Getting requirements Project planning (based on initial
reqs.) Project planning (based on customer eval.) Risk analysis
Cost/Benefit and threats/opportunities analysis Based on initial
reqs. and later on customer feedback Engineering Preview it Do it
Customer evaluation Slide 5 Diagrammatically said Plan Assess risks
EvaluateBuild Point of no return Plane of application Costs Threats
Prototypes Slide 6 Another view By Prof. Peter Khaiter Costs
Prototypes Threats Slide 7 Details of the Spiral SDLC From Van
Vliet Slide 8 The Spirals Steps 1)Define requirements Through user
involvement and analysis of existing system 2)Initial new system
design 3)Construct and evaluate an initial prototype Rough
(skeletal) system attribute framework 4)Construct a further
(refined) prototype Basing it on evaluation of initial prototype
Defining its scope Planning its development Implementing it
5)Overall (system-wide) risk assessment 6)Prototype assessment (as
per step 4) and possible development of further prototypes 7)Repeat
steps 1-5 until refined prototype meets user expectations
8)Construct the system (based on final refined prototype) 9)Test
and maintain the system Slide 9 The Win-Win Spiral Simply put Make
everyone involved happy and youre practically guaranteed project
success! How can you try an do that? Make sure every phase in the
spiral starts off with: Understanding who everyone is Understanding
what everyone wants Reconciling everyones needs
