For several decades, organizations have had two alternatives when they needed new information systems. They could build a new system using their own developers, or they could buy a system from an external vendor. The “build” approach, like a custom suit or dress, offers a close fit to business requirements. But as with custom tailoring of clothing, it typically means higher costs and a long wait. Systems from vendors, like off-the-rack clothing, don’t fit as well but are typically much cheaper and can be installed faster. Sometimes companies can configure these systems, but firms often find it easier to change their business to suit the system than vice-versa.