Assessing scheduling claims in PDF formats only

Hi there,

For people who have a very little knowledge of P6 Schedules: How do you argue that in order to assess schedule claims you need more than PDFs of the schedule.

I need a very simple and preferably a visual illustration to demonstrate:

 Schedules in PDF format cannot be the true representative of the program and not good enough for claims assessments.

Apologies in advance if this sounds too basic to you.

Thanks