During the lab
session, the students worked in groups of 3 plotting graphs from
examples of scientific data. Each student plotted a graph and
commented on the difficulties that he/she encountered while working
on it. Then, the students exchanged graphs and critiqued each other's
work.

After
a class discussion about the common difficulties (i.e. scaling the x
or y axis) that were encountered during the exercise, the students
worked individually (or pairs) with GRAPHLAB on the computers.
GRAPHLAB is an interactive windows program that has lessons for
scaling and drawing a best fit line.

Yes, we only had "rebuilt" 486 PCs running Windows
3.1 and 95. There were only 6 on carts for all the lab sections.