Towards apriori and posteriori estimation models for renewable energy projects in software engineering

Currently, cost estimation for renewable energy projects is one of the important issues in software engineering projects. It has been observed in the industry that cost estimates of renewable energy projects often differ from the final costs by a factor of two or more; such large overestimates impact on process integrity and, ultimately, on final quality. RE development organizations are expected to deliver projects on time and on budget in a context of fixed-price contracts. To meet these market demands, managers must determine well in advance such estimates which called is the apriori cost estimation. These organizations typically use an estimation techniques based either on informal personal or organizational experience, or on aposteriori estimation models developed internally or developed by outside consultancy. This paper collects most of the common used models of the cost estimation models throughout the apriori and aposteriori contexts, and we highlights some of their mixed uses between these estimating models in software engineering development projects for RE and lists some of the estimating techniques used in A priori and A posteriori contexts.