The O'Donnell Foundation is devoted to building model programs to enhance the quality of education.
|Guidance Recommended: This simulation is very effective when used in conjunction with a lecture, homework or other teacher designed activity.|
|Under Construction: This simulation is a preview version, and may have functional or usability bugs.|
|Classroom Tested: This simulation has been used and tested in the classroom, and on multiple computer platforms. The simulation has been refined based on that experience and on student interviews.|
|Gold Star: This activity is identified as aligning with principles of education research|