The most widely used method for cost estimation is COCOMO.

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COCOMO (COnstructive COst MOdel) is a widely used method for estimating the cost of software development projects. It was developed by Barry Boehm in 1981 and has been updated over the years to reflect changes in software development practices. COCOMO is based on a set of algorithms that use various factors such as project size, complexity, and personnel experience to estimate the cost and effort required to develop a software project.

The Most Widely Used Method for Cost Estimation Is COCOMO