The Constructive Cost Model II, commonly called COCOMO II, is a software cost estimation model that estimates effort, schedule, and cost using software size and cost drivers. A key size input is typically expressed in source lines of code, often represented as SLOC or KLOC. Other factors, such as personnel capability, product complexity, platform constraints, reuse, and development environment, adjust the estimate, but size remains fundamental. Cyclomatic complexity is useful for testing and structural complexity analysis, not primary COCOMO estimation. Defect density measures quality after defects are identified. Feature point analysis can support sizing in some contexts, but the direct necessary input among the choices is lines of code.
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