The HUPO Brain Proteome Project (HUPO BPP) is dedicated to the analysis of the brain proteome and has initiated two pilot studies in order to elaborate a standardised system for data collection and reprocessing. Samples of mouse brains (different developmental stages) and human brain tissue (biopsy and post-mortem samples) were shipped to different laboratories in Europe, Asia and the US that were invited to identify as many proteins as possible using their own approaches. In addition, a centralised data reprocessing strategy has been elaborated in an iterative way to generate highly reliable lists of identified proteins. This consortium could be a good example for a standardized proteomics workflow.