Ask HN: How to become a more data-driven person/employee?

Just a first quick thought here... if you want to proceed into management, you'll want to show that you can not only sell but also help other salespeople improve their performance. How will they know they're improving? You could start with some very simple metrics -- total $ of sales, avg $ sales per customer, # of calls made, % of leads that have closed -- and start plotting them on a daily or weekly basis with a retrospective meeting. You should be able to do this with spreadsheets, and gather the data from your co-workers daily during a 15-minute coffee break. See what the data tells you. See if you can help somebody improve their metrics.