The Solution Design Document (SDD) is a document that describes the technical design and implementation details of an automation solution. It is based on the Process Design Document (PDD) that defines the business requirements and process flow. The SDD should follow a standard template that ensures consistency and quality across different automation projects. However, some customers may have their own template or preferences for the SDD, especially if they have a Center of Excellence (CoE) that oversees the automation governance and best practices. In such cases, the UiPath Automation Solution Architect should use the customer's template or adapt the default UiPath SDD template to meet the customer's expectations and standards.
Reference:
Become an Automation Solution Architect | UiPath Academy
Roles of a Solution Architect in Automation, RPA Setting - UiPath
Template of PDD and SDD - UiPath Community Forum