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Considering a direct correlation between projects requirements details levels and their performance, this paper aims to evaluate whether the adoption of more extensive and detailed cost, time and scope estimation processes based on both practices, traditional and agile, and executed concurrently with the supplier selection stage, could guarantee greater accuracy in these estimates, thus increasing project success rates. Based on a case study for the information system project implementation into the legal area of a large Brazilian company, five suppliers had their proposals analyzed and compared in terms of the costs and deadlines involved, as well as the project management processes used in theirs estimates. From the obtained results, it was possible to observe that not all companies follow, at least during the prospecting phase, their service proposals described management processes, according to the theory. Another important finding was that the proposals involving, at least partially, agile approach concepts, were more likely to justify their estimates. These proposals still presented lower values, whenever compared to those less adherents to the theoretical concepts, as those based on traditional concepts.