Try diagramming your notes.
When you talk to many sources you collect so much information you can get lost in it.
Each source you talk to only sees a small piece of the big picture. You get a sense of the big reality by connecting all these small pieces.
It helps to draw a circle for each piece of information and connecting them together.
You can do this on your computer and share it among your team members with Google Docs. Just open a new file and choose Drawing. You can insert boxes or bubbles fill in text and connect them with lines or arrows.
When you diagram your sources or the information you gathered you can see visually what pieces of information came from many different sources — and so is credible and relevant and when a piece of information came from only one source and may be less credible or tangential.