Slide 28 of 241
This is one illustration of APQP document relationships. While I find this type of chart somewhat confusing (it is a bit more abstract than a timeline), I include it as some folks like this type of association. It does give a sense of what are inputs and what are outputs on a high level.
Business Quality Objectives
Special / Critical Characteristics
Customer Specified Special / Critical Characteristics
APQP Forum Discussions