The implementation of the Bologna Process (BP) did not go as smoothly as the Bologna Follow-Up evaluations suggest, and the consequences of the BP for the various European higher education systems and universities are much more diverse than represented in these various studies. Relatively few research and policy documents taking a more critical stance are currently available while a systematic overview of such studies is still lacking. The purpose of this article is to provide an overview and consequently reveal the most prominent views concerning the BP, as well as emphasise the critical developments over a longer period. A longitudinal literature review was carried out, consisting of 161 studies between 2004 and 2013, that resulted in a final selection of 91 studies. The article demonstrates that the studies available in this search show that issues concerning "challenges," "tensions" and "critical viewpoints" about BP exist, and yet it confirms the need for further research. It is further suggested that demonstration of the impact of the BP discourse would benefit from the adaptation of a continuously critical reflective approach as an ongoing part of the overall discussion about the BP.