olemus
süsteemiarenduse mudel, iteratiivse ja koskmudeli kombinatsioon
= a system development model combining the iterative and waterfall models

ISO/IEC/IEEE 24765:
spiraalmudel
tarkvaraarenduse protsessi mudel, milles koostisosad, tavaliselt nõuete analüüs, eel- ja detailprojekteerimine, kodeerimine, integreerimine ja testimine, sooritatakse iteratiivselt kuni tarkvara valmimiseni
= spiral model
model of the software development process in which the constituent activities, typically requirements analysis, preliminary and detailed design, coding, integration, and testing, are performed iteratively until the software is complete

vt ka
- spiraalarendus