In the past, organizations typically developed their own software using their own in-house programmers and staff. This led to the development of many useful, but diverse and unconnected legacy systems. During the past few decades, many software vendors have focused on developing software for specific applications, creating many specific software products, to include materials requirements planning (MRP) systems, advanced planning systems (APS), and enterprise resource planning (ERP) systems. Thus, the software field has evolved from each organization creating its own software to a vendor system selling off-the-shelf packages. An even later development has been open-source software products.
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