Alpha clustering in nuclei at present is a well studied and reasonably well accepted property of the nucleus. Less well appreciated and more ambiguous is the role of A = 3 clustering, i.e. helion and triton, in nuclei. Here we try to place A = 3 clustering in nuclei into its proper perspective, first by pointing out strong experimental evidences which indicate its clear presence in nuclei and second showing as to how to include these A = 3 clusters in a proper and consistent theoretical understanding of the nuclear phenomenon. © 2011 World Scientific Publishing Company.