Magic Is A Science. Like the higher-level mathematics of our modern world, magic is an 
extremely esoteric science that requires natural ability and discipline to learn and use.
Nonetheless, magic funtions according to a set of knowable laws predicting its behavior 
absolutely. It is not necessaryily the case in a given scenario that all of these laws have
been discovered, however, since the discipline of magic is quite complex. The existence of
a logical foundation to magic means that some powers, once learned, are simply and easily
performed. The most complex effects, on the other hand, can only be reproduced by the finest
minds. Research and experimentation tends to be more theoretical than practical. It is 
common for world with a scientific style of magic to harbor schools or academies that
formally instruct students of magery. Most worlds with scientific magic have an even blend
of mages and specialists. Metamagicians, though are more common in this type of world than 
in "chaos" or "art" worlds. Acedemicians are found quite frequently in this class of world,
since their style of research lends itself to the scientific method. A peculiarity of this 
world-view is that the quantity is necessarily increased over time. Since magic is just
a sub-field of a larger scientific discipline, knowledge of dweomercraeft will tend to 
build up as researchers enlarge the field. This means that barring extraordinary
circumstances, the number of wizards will tend to increase(and probably at an increasing 
rate). It is entirely possible that a campaign world with scientific magic could
experience a "magical revolution" that parallels our real world's industrial revolution as 
spell use spirals upwards.

Science/Abundant: Magic and wizards behave much like physics and engineers do in our real
world. A huge amount of magical knowledge exists, many different schools and kits are 
represented, and large colleges and universities teach magic to eager students. Wizards in
the economic sphere produce consumer goods and powerful weapons, often pushing the mundane
craftsmen totally out of business. POlitical power is wielded solely by wizards; the armies
are composed of summoned beings or magically-assisted warriors with wizards as artillery. 
In such a campaign, non-wizards often can play little but a supporting role.

Science/Normal: Wizards and magical items occur with the same frequencey as in the AD&D norm,
but only because of a lack of extant information. Because magic is just a scientific 
discipline, the slow pressure of inventive wizards will eventually push back the frontiers
so that anything will be possible using magic. A better world in which absolute knowledge
is available is just generations away.

Science/Little: Either because it was lost or hidden, magical knowledge is difficult to come
by. Wizards must be incredibly talented, so a great many fail to pass from apprentice to 
master. A few rare colleges of magic probably exist in out-of-the-way locales, but wizards
are difficult to find away from them. Magic is well-regarded by the common people, but still
held in awe.