While ISRS uses a “Chart of Accounts,” Workday uses a system known as the Foundation Data Model (FDM). Workday’s FDM functions similarly; however, the terms (Worktags) and language used are slightly different. Additionally, Workday’s FDM will potentially have more dimensions than ISRS; one value could become multiple Worktag values in FDM.
Workday FDM Quick Reference Guide