What is the definition of 'done'?

All tasks have upstream and downstream connections. They are part of a 'value stream'.

To get the definition of 'done', pick your 'start' and 'end' points. Negotiate with your stakeholders so they are clear where your boundaries are. Adjust your boundaries in response to changes in context.

The definition of 'done' is crucial for hand offs. Receive outputs from upstream processes when they are 'done', this will avoid delays, rework and frustration on your part. Pass your output to downstream processes only when you are 'done', this will increase your credibility and influence. The downstream processes are in a sense, your customer.

A definition of 'done' will avoid the loss of credibility by celebrating bigger than warranted. It will prevent the loss of morale by not celebrating enough.

A definition of 'done' is the target that everyone is aiming for, the clearer the target, the higher the chances of hitting it in a predictable and repeatable manner.