Re: Is is possible to send notifications based on summary fields in parent records?

The notification wont change based on a summary field change.

But, you can set the notification to tricker based on the child record change when it meets the same criteria.

You will need to send the summary field back to the task table.  

Then your notification can trigger when the value is 0 and the task is marked complete.  (Or some other criteria based on your use case).

Does that make sense?  Will that help you?