Limitations

Only two of the three groups in the study will be randomly assigned. Although pure randomization is preferred, buy-in from a more traditional teacher to consistently use movement during a class period may be difficult. This non-randomization will be used to avoid a negative experimenter effect. The selection of three different teachers in three different schools may also present a threat. All possible precautions will be taken to select three teachers known to be effective in three schools as similar as possible in organization and school culture. Additionally, a testing threat may exist since students will be taking the Gates-MacGinitie test both at the beginning and end of the school year. This is considered a minor threat as the testing sessions will be nearly nine months apart. Finally, mortality is an issue in a study over the course of an entire year, especially in a school district with a mobility rate as high as Tulsa Public Schools.
 * Limitations **