I believe the separate disciplines need their own dedication, and most often they are mixed to prove comprehension.
Many times I have noticed students too busy writing down notes and failing to actively listen to a presentation. In order to avoid this, telling the students they will recieve study material after the discussion often settles students into active listening; more so if I follow up with brief questions frequently.
Writing and speaking are my favourites for gaging comprehension.
I find writing is the most difficult discipline to incorporate because not everyone's background is the same.
