sentences:  could be one of the main examples of advanced postponement literature, as it grouped the postponement strategies in 2004 from Zinn and Bowersox (1988) into more accurate groups and explains how exactly the strategy is matched to a type of postponement.. 
  
  Yang et al.stated that in order to cope with high level of uncertainty, purchasing postponement (purchasing materials as close to production as possible) product development postponement may be applied => no physical inventory.In contrast, to deal with low uncertainty we use logistics postponement (reduction of obsolete inventories, just-in-time delivery) and production postponement => semi-finished product.