Despite the fact that during the last decade, many of the ERP projects have led to considerable tangible and intangible
development in different areas and also to attain competitive advantages for organizations, there are a variety of stories of
organizations failure in performing the ERP. One of the most important causes of failure is the organizations’ indifference
in identifying the most important criteria of an appropriate system and therefore the insufficiency of selecting phase of the
system. The present article tries to identify the most important criteria of ERP selection that organizations should put into
account in the process of their selection, through a complete study on the past literature and researches and also including
the exports’ view- points. Therefore, we have used a combined approach in this study. After a thorough review on
literature and extracting all the identified criteria through the previous valid studies, using Delphi method, the following
factors: cost, software quality, vendor and software capability were identified as the main factors which should be
considered by the organizations. These criteria were, then, ranked using Shannon Entropy technique and the vendor was
identified as the most important criterion
