The actual services offered by ASPs and Internet service firms differ. Internet service firms typically offer up-front consulting and design services, whereas ASPs usually don't. On the other hand, ASPs offer ongoing site operation and management services, while most Internet service firms do not. Additionally, there are differences with respect to the approach each type of company uses in developing e-commerce sites. One of the differences is the amount of customization each type of company offers.
ASPs perform minimal customization while Internet service firms deliver custom projects.
Duration of the projects is also different, with ASPs generally delivering on shorter project time lines than typical Internet service firms. Each type of company also has its own payment structure. Internet service firms typically require a lump sum payment. ASPs spread their fees over several years on a monthly basis. There is quite a bit of money at stake in the ASP market.