What are the benefits of gathering parent feedback when developing the Present Level of Academic Achievement and Functional Performance (PLAAFP) section of an IEP?

Topic 3 DQ 1
What are the benefits of gathering parent feedback when developing the Present Level of Academic Achievement and Functional Performance (PLAAFP) section of an IEP? Describe strategies that can be used before and after the IEP meeting to ensure parent input is gathered in a collaborative manner.
Need 250 words with 2sources
Topic 3 DQ 2
Gathering information for a child study team meeting can come from a variety of sources. Discuss the possible sources. Which stakeholders play a role in gathering the information?