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...h yielded promising prediction results indicating, though, that the model required a more systematic development approach to establish the topology and parameter settings so as to obtain better results. Dolado (2001) searched for the cost estimation equation of the relationship between size and effort by using Genetic Programming tree structures representing several classical equations, like the linear, power, quadratic, etc. The approach reached to moderately good levels of prediction accuracy results by using solely the size attribute and indicated that further improvements can be achieved. Mittas et al. (2010) proposed the Demming Regression for modelling the relationship between software effort and size on the four datasets, Desharnais, COCOMO, Maxwell and Nasa93 based on the assumption that the observed values of the variables are measurements which coincide with the actual size values. Under this assumption the proposed technique estimated the regression coefficients and showed significant improvements in comparison to the classic Ordinary Least Squares regression. In summary, the literature thus far, exhibits several research attempts focusing on measuring effort and size and accepting them as ...