Here's a nice page on using rubrics in teaching, something that can be added to a summer camp activity or any of the kits: http://www.learnnc.org/lp/pages/3735
In a nutshell, when doing something comparative, have the students list for you words that exemplify the quality of something (for example -- slime. You might pick "gooeyness" and "color" and "stickiness") and then judge a sample on a scale of 1 to 5. Everyone can pick a number; add them all together and divide by the number of people (to make it easy on yourself if you have an impatient class, divide the class and have one group judge on one attribute and another judge on a different attribute. YOU do the math, or hand someone a calculator and ask them to do it.)
Rubrics can be used as a starting point for a discussion in many different areas.
