This document discusses options for rationalizing workflow in SharePoint Online. It outlines the three main workflow engines - the SharePoint 2010 engine, SharePoint 2013 engine, and Microsoft Flow. It compares the development experiences, architectures, and customization options of each. Key scenarios like elevating permissions and extending workflows are examined. Choosing the right tool depends on factors like maintainability, lifecycle management, and whether the workflow needs to be configured, customized, extended, or fully developed. Microsoft is moving focus to Flow and Logic Apps, so older SharePoint workflows may not receive further investment.