Categorisation of criteria
Criteria for buyer-supplier relationships have been categorised in several ways by
researchers. One of the distinctions has related to the activities within the studied
process and the input and output of that specific process. A categorisation presented
by van Echtelt and Wynstra (2001) draws on the differentiation of input, throughput,
and output of the buyer-supplier relationship. The model was developed in order to
understand how to manage supplier involvement in product development and
addresses enabling and driving factors as well as processes and potential effects