Major modifications include significant functional changes to an existing system, converting to a new system, and introducing new systems or data due to corporate mergers or acquisitions. Major modifications should be implemented following a well-structured process similar to the SDLC (systems development life cycle) described in the "Development" section.
Major modification standards should address applicable project activities such as requirements analysis, feasibility studies, project planning, software design, programming, testing, and implementation procedures. Refer to the "Project Management" and "Development" sections for additional project management details. Refer to the "Conversion" discussion later in this section for specific considerations relating to major modifications.