CCOSTAT is a method for generating multi-variable and non-linear models from existing data. The mathematical formulas created allow to statistically frame the results provided. Data collection by the user is empirical: the parameters are chosen freely, their relevance is analyzed by a correlation study. Projects in the same database must belong to the same technological family. Costs have to be standardized via parameters in order to avoid distortion due to inflation, currency differences, etc. Technical parameters can be numerical quantities (like a weight, a volume, a number of parts…) or represent an ordinal classification (quality class, type of operation…). Model Generation used a multi-parameters formula, adapted to each encountered situation which is generated ...