“…References (Ahmed et al, 2005;Papatheocharous et al, 2010) used fuzzy logic and fuzzy decision tree, respectively for software effort estimation. Other works such as (Heiat, 2002;Lopez-Martín, 2011a,b;Lopez-Martín et al, 2008 developed neural network models and compared their works with regression models. Regression models such as linear, nonlinear, stepwise and ridge have been used to predict software effort as shown in (Jiang et al, 2007;Xia et al, 2008;Tan et al, 2009;Li et al, 2010).…”