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Software development effort estimation is the process of predicting the most realistic use of effort required for developing software based on some parameters. It has always characterised one of the biggest challenges in Computer Science for the last decades. Because time and cost estimate at the early stages of the software development are the most difficult to obtain, and they are often the least accurate. Traditional algorithmic techniques such as regression models, Software Life Cycle Management (SLIM), COCOMO model, function points, etc, require an estimation process in a long term. But, nowadays that is not acceptable for software developers and companies. Newer soft computing techniques to effort estimation based on non-algorithmic techniques such as Fuzzy Logic (FL) may offer an alternative for solving the problem. This work aims to propose a fuzzy logic realistic model to achieve more accuracy in software effort estimation. In this innovative model, by applying fuzzy logic and using training procedure to the system, the accuracy of the results is desirable in comparison with the famous traditional algorithmic technique, COCOMO II model. This novelty model will lead researchers to focus on non-algorithmic models to overcome the estimation problems. Our validation experiment was carried out on artificial dataset as well as the COCOMO standard dataset.