T-shirt Sizing

Someone's asked for effort estimates on next quarter's roadmap. The team barely understands the items. A number will imply certainty nobody feels.

T-shirt sizing is a relative estimation technique using sizes — XS, S, M, L, XL — rather than precise numbers. You compare items against each other and against previous work of similar complexity, calibrating what each size means in your team's context. The imprecision is the point.