I made this lab for my students with special needs. I wanted them to demonstrate that they could use a graduated cylinder and complete the scientific method in its simplest form. has a short self assessment at the end as well. you'll need Kool-Aid squirt bottles. At our Walmart, I got 6 for a buck in multiple flavors. Students have to average data, then compare with label volume for those bottles. they have to draw a bar graph. they have to analyze information. my students took 2-45 minute periods to complete. I have students complete with partners. if your students can handle it; three to a group is great.