HDPE boards or standard embossed images at random, with half the group receiving HDPE and half the group receiving standard embossed images. Each participant was also given lab directions in the medium of their choosing (i.e. braille, large print, read aloud). The participants were allowed to work in groups, in the same way a standard lab course would allow, and asked to complete the lab activity. Each activity, one astronomy and one biology, included a set of questions testing the understanding of the materials.