In order to study the problem of effective user participation in ERP implementation, we employ an exploring case design method and the grounded theory data analysis approach to build a theoretical model to improve effective user participation .The results show that brainstorming can be used as a method to facilitate users' effective participation, and it has a positive effect on user involvement and active participation. This paper provides useful guidance to knowledge of ERP implementation and the literature extend of field of user participation.

ERP implementations    user participation    brain storming