Everyday activities in a manufacturing environment sometimes result in deviations to the process because of a faulty intervention performed by operators. Normally, re-training is used as a mean of "correcting" the individual involved; this is normally Not the real issue though. Knowledge itself does not modify behavior. We will discuss the factors that facilitated the successful implementation of a human reliability function at our site. By rediscovering human nature and controlling variables associated with optimizing human performance, a reduction of more than 50% of the quality events related to human actions has been achieved.