The whole point of the Lean thing is not to have estimates for points like Scrum has right? We are not going to have a burndown chart and tell the stakeholders: "Look, we have to make some sacrifices given this velocity." We are just going to work on the tasks we have to do anyways and it doesn't really matter how long it takes as we have to charge forward. This is more the thing of a product company doing maintenance and improvements than a consultancy trying to insulate itself from having to eat the costs of scope creep. That said, a gut estimate of whether something is a small, a medium, a large, an extra large, etc. is helpful. T-shirt sizes of this shape have crept into the process apparently. There is no reason to do specific estimates as estimates are always wrong so let's just have tee shirt sizes instead of points. They are a gut feeling just so that everyone knows what is going on. When you screw up one of these estimates there should really no consequences honestly.
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