The upper and lower boundaries of a boundary spell exist and are
something appropriate - e.g. a triangle might be a pyramid, a circle
might be a dome or a sphere.
+
+## Group Learning
+
+The ArM4 book *Kaballah* had a sidebar on group learning that was
+overly powerful. The ArM5 book *Realms of Power: Divine* had one that
+was overly weak -- you'd never actually want to do it. The Revised
+Edition of that book no-longer has such a sidebar. These rules
+attempt to find a middle ground. Comments welcome.
+
+A group of people may study the same text and discuss it together.
+The maximum size of the group is limited to twice the Communication
+score of the highest member; excepting that it is always permissable
+for two people to study together.
+
+Each member calculates an Advancement Total normally; including
+bonuses and maluses relating to both studying from texts and learning
+from others.
+
+The totals for each member are summed, the communication of each
+member is added, and if any member has the Good Teacher virtue then
+that is added (+5) at most once. This grand total is then divided by
+(the number of participants + 1) and rounded up to produce the new
+Advancement Total.
+
+In addition each member may take an additional two points of exposure
+experience in an appropriate skill related to the discussion (likely
+to be one of Artes Liberales, Philosophiae, Theology, Magic Theory, or
+an appropriate Language).
+
+### Summae
+
+Summae may be discussed only if all of the members are eligible to
+discuss the summa in question.
+
+### Tractatus
+
+Tractatus may only be learned from once, whether through reading or
+discussion.
+
+### Florigelia
+
+Seperately to the individual tractartus, a florigelium may be
+discussed as if it were a summa with a level equal to the number of
+included tractatus and a quality equal to sum the qualities of the two
+best tractatus.
+
+### Hermetic Arts
+
+The maximum size of a group for learning Hermetic Arts is two.
+Hermetic Arts can be group studied from vis, however this requires a
+quantity of vis for each maga.