Open Toolsets: New Ends and New Means in Learning
	      Mathematics and Science with Computers

		           Andy diSessa
		 Graduate School of Education, UCB

Open toolsets are a new genre of software that involves a greater
number of smaller units than conventional educational applications.
The units are intended to be highly inspectable, modifiable,
extendable, and combinable with each other. I will illustrate open
toolsets with examples created in the computational medium, Boxer.

Many of the reasons open toolsets are valuable are more cultural than
technical.  For example, this genre may allow more organic and
extended development cycles, involving a less technologically
sophisticated but more educationally savvy community. Hence software
and learning cultures may gradually co-evolve.