Just to extrapolate on Al's response, and based on my own interpretation of the PPAP process;
The PPAP is intended to demonstrate to the customer that the tooling, processese and controls that you have developed and implemented are capable of consistently meeting the customers requirements as shown on the customer print, purchase order, quality manual, and other documentation.
The PPAP is (generally) the 'best you will ever be', and should be able to be used as a benchmark against which all further production is measured.
Hope this is some help to you. If not, I'd be happy to go into further detail, either here or privately.