The document discusses Putnam's resource allocation model and the COCOMO cost estimation models, including: 1) Putnam derived the Rayleigh-Norden curve, which relates software development effort, time, and lines of code based on the technology constant Ck and project environment. 2) The Basic COCOMO model estimates effort, time, staff size, and productivity for projects based on size (KLOC) and type (organic, semidetached, embedded). 3) The Intermediate COCOMO model improves accuracy by including 15 cost drivers that adjust estimates based in development environment factors. 4) The Detailed COCOMO model captures more project characteristics to construct software estimates. COCOMO-II