sentences:  The fourth challenge discusses lack of typology in postponement.Researches should not only pay attention to manufacturing and logistics related postponement but also to service postponement, since the concept takes its place in services too.Finally, the fifth challenge tells that in order to conduct a solid research plan on postponement one should consider the triangulation model with first step – how postponement is implemented in a global supply chain, second step – where, to what extent and how postponement is applied, third step – benefits of postponement in the customized supply chain.