Hi,
I am a Scrum Master & Jira administrator seeing a value in velocity measuring on Sub task level.
I propose to improve the burn down chart to be able to gain more learnings from the sprint.
Add a 'drop down list' in existing 'burn down chart report' covering the scenarios below:
1) Sub-task & Story Point
2) No of Sub tasks
3) Storys & Story Point
4) No of Storys
(5. Storys and T-shirt sizes)
All these gives valuable learnings to bring to the team on both individual level and team level, to get better on estimating time and improve predictability for sprint. This data is important especially in a newly created team with little knowledge in Scrum.
(Background: Hardware business: We are using Story to bring a value, Sub tasks to describe the work needed and each resource are estimating time in story point on sub-task level. We use T-shirt size on Story Level to get early estimates on velocity.