Distance teaching universities

Legend: Two kind of arrows are used in the picture: full arrows stand for "obligatory", broken arrows for "optional".

Imagine the picture as horizontally divided into three parts of equal size.
The middle part shows on the left a box "University Learning Materials" and on the right a box "Student learning". These two boxes are connected by full arrows in both directions, marked "CMAS" and "TMAS".
Eight bubbles are distributed over the picture, 4 above and 4 below this central part. From each bubble an arrow points to the center of the picture.
Bubbles above:
1. student meetings (optional)
2. regional office (optional)
3. study centre (optional)
4. tutor/counsellor (obligatory)
Bubbles below:
1. computer records (optional)
2. telephone (obligatory)
3. resources WWW (obligatory)
4. summer shools (optional).