There are basically 5 phases of the project that need to be completed sequentially:

Phase 1: The Assessment and Project strategy phase

Look at the business needs, map these to EDI, determine gap and implications, prototype if necessary, agree and sign-off scope

Phase 2: The Design phase

Naming standards, interface design, future flexibility, audit requirements and technical impact, DRP and archiving strategies

Phase 3: The Configuration phase

Confirm business requirements, basis config, functional config, mapping, QA and testing and sign-off

Phase 4: The Development phase

When non-standard SAP functions need to be implemented. Functional specifications, technical specifications, develop and configure, QA and testing and sign-off.

Phase 5: The Operations phase

Define support roles, capacity planning, job monitoring, failure recovery and problem resolution