The implementation of Electronic Data Interchange (EDI) has been the focus of scholars for the past few decades. The tool is viewed as vital for transmission of business data electronically. Despite the substantial benefits, only a fraction of companies Worldwide have implemented EDI. Thus, this research is intended to examine the actual scenario of EDI implementation by focusing on manufacturers in Malaysia. The key objectives of this research are to identify EDI barriers, benefits, determinants and present integration levels; to discover the differences existed in EDI barriers, benefits, determinants and integration level based on demographic variables; to examine the influence of barriers, integration level and determinants towards the extent of received or perceived benefits; and to investigate influence of benefits on the improvement in firm performance, based on users' perception.