We have a two person team here. My co-worker works with the SME's and writes the curriculum for the course, and I create it in Storyline, create graphics and record audio or video as needed. Using a storyboard is how we share the information. I will work with them to help come up with ways to make the content interactive, and let them know what I can and can't do with storyline. I also help "plain talk" the narration so that it doesn't sound like we are reading out of a textbook.
We've also found that using the storyboard helps keep the SME's focused on the content, rather than the pictures or graphics. If we want to bounce a presentation idea off the SME's, then I will create a quick prototype, and share it with them. If the SME's like it, then my parter will put a screen cap of it into the storyboard for me.
Link to Template:
http://bit.ly/2mBJlYN