Excerpted from the abstract:
...self-correction does not always happen to scientific evidence by default....History suggests that major catastrophes in scientific credibility are unfortunately possible...Careful evaluation of the current status of credibility of various scientific fields is important in order to understand any credibility deficits and how one could obtain and establish more trustworthy results. Efficient and unbiased replication mechanisms are essential for maintaining high levels of scientific credibility...In the absence of replication efforts, one is left with unconfirmed (genuine) discoveries and unchallenged fallacies. In several fields of investigation, including many areas of psychological science, perpetuated and unchallenged fallacies may comprise the majority of the circulating evidence.Ioannidis, J.P. Why Science Is Not Necessarily Self-Correcting. Perspectives on Psychological Science November 2012 vol. 7 no. 6 645-654.