The document discusses the evolution of eProcurement models from EDI to internet portals to direct connects to third party solutions. It provides overviews and assessments of the functionality, pros/cons, and maturity of the EDI, internet, and direct connect models. The EDI model established secure transactions but offered limited functionality. Internet portals allowed supplier integration but required rekeying data and had limited availability. Direct connects enabled buyer-supplier connections but with high costs and complexity.