The 100 participation points will be given according to your contribution to the other forum topics. My assumption is that everyone will participate, do the work, and interact online. However, my experience tells me that I need to do more than assume this. That is why I need to assign a grade to participation. You can't get any points if you do not contribute anything to the Forum.
Contribution means more than just checking in or inserting any stray thought.
It means being thoughtful and analytical, whether discussing the assignment material or bringing your own experience into the discussion. Our family didn't have a gendered division of labor. Thoughtful analysis has you asking why this is so. What conditions makes your family different than the norm. This is what everything in the above bullet adds up to.