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an IT system’s development model that has four sequential phases: identification, design, construction, and evaluation and risk analysis, arendsuprotsess, millel on korduvalt (iteratiivselt) neli etappi - vajaduste analüüs, disain, arendus ja hindamine koos riskide analüüsiga
spiraalmudel . Projektijuhtimise terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://pre.sonaveeb.ee/search/unif//p3m/spiraalmudel/1/est (17.06.2026)
