Quality　function　deployment　(QFD)　is　a　methodology　for　translating　customer　wants　(WHATs)　into　relevant　engineering　design　requirements　(HOWs)　and　often　involves　a　group　of　cross-functional　team　members　from　marketing,　design,　quality,　finance　and　production　and　a　group　of　customers.　The　QFD　team　is　responsible　for　assessing　the　relationships　between　WHATs　and　HOWs　and　the　interrelationships　between　HOWs,　and　the　customers　are　chosen　for　assessing　the　relative　importance　of　each　customer　want.　Each　member　and　customer　from　different　backgrounds　often　demonstrates　significantly　different　behavior　from　the　others　and　generates　different　assessment　results,　complete　and　incomplete,　precise　and　imprecise,　known　and　unknown,　leading　to　the　QFD　with　great　uncertainty.　In　this　paper,　we　present　an　evidential　reasoning　(ER)　based　methodology　for　synthesizing　various　types　of　assessment　information　provided　by　a　group　of　customers　and　multiple　QFD　team　members.　The　proposed　ER-based　QFD　methodology　can　be　used　to　help　the　QFD　team　prioritize　design　requirements　with　both　customer　wants　and　customers＇　preferences　taken　into　account.　It　is　verified　and　illustrated　with　a　numerical　example.　©　2008　Elsevier　Ltd.　All　rights　reserved.