Action vs. Clickthrough rates

Vinay Bhagat:

Clickthrough is the percentage of recepients of the message who actually click through. Note recipients is sometimes less than the total number of sends. Action rate is percentage of recipients who take some form of action on your website, e.g. sign a pledge, make a gift, advocate etc.

Thanks for the response. Can I ask one more question?

What exactly is stewardship, by Convio's definition? I am looking at Convio's original presentation to my organization, which was long before my time here, and there is no real definition of stewardship in it, just a mention.

Thanks again!