Hey Carrie, did you ever get an answer to your questions? If you still need support with translating your business metrics to Tableau calculations, feel free to reach to Luke@goDataDrive.com. I'm happy to spend time over coffee showing you how Tableau interacts with your data. Metrics like active headcount and headcount over 12 months could leverage Tableau's filters and calculated fields to (hopefully) easily answer your questions. Cheers!