There are two main approaches to the teaching of science. In all grades, but particularly in the lower grades, Nature Studies is taught. Nature Studies is an approach developed by Anna Botsford Comstock. The approach is to allow the students explore nature around them and learn how to be good observational scientists. The second approach is direct laboratory instruction. In the second approach the students are taught the experimental process. In the older grades (third grade and above) the students use Delta Science Modules.