Complex investment decisions using rough set and fuzzy c-means: An example of investment in green supply chains.

•Green supplier development programs require significant organizational resources and investments to succeed.•Green supplier development programs have many dimensions and big data sets to consider.•Novel integration of rough set theory and fuzzy clustering means (FCM) provides a methodology for decision modeling.•Application of the methodology to green supplier development investment shows practical and theoretical usefulness.•Directions for future research on green supplier development investment are presented.