PDD - Process Design Document is prepared by BA, which describe about the business flow(we also call it as “AS IS” process). It also includes all other information like FTE, Transaction load, Business rules, known exception, unknown exception, Error handling, Risks, Assumptions, SLA, Dependencies etc.
SDD - Solution Design Document is usually prepared by Architect/ Developer. which describe about the automation approach(we also call it as “TO BE” process). It explain about architecture design, applications involved in automation, Decision logics, exception handling, modular work flow level details, reusable components etc etc…
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