I am a web developer/designer and I constructing my plan/strategy on the process on delivering a project. My problem is what happens after the delivery.
As far as I know I have to send a plan/aggreement to my customer, to inform him how the page will look like, how it will work, time needed and the cost. After a discussion, assume that they deal is on.
Suppose that everything goes fine, the project is delivered and running. It is very common thing that after a period the customer may come back and ask for a change (small or big), an addition, something extra.
My question is what should I include in the agreement about the after-delivered period? Should I tell that any changes after delivery will have a cost ? Should I avoid it and have a new agreement about the extra thing? How to move in this stage?