Schools gladly passed these classes off to Apex because teachers could be redeployed into higher-enrollment classes, increasing productivity.

FORBES: Defining Performance In Disruptive Innovation

In fact, nonconsumption of these classes was enormous because most individual schools could not afford the luxury of offering these lower-enrollment classes.

FORBES: Defining Performance In Disruptive Innovation

In the early stages, this means going after the lowest-enrollment classes, allowing a school district to offer programs without reducing overall productivity.

FORBES: Defining Performance In Disruptive Innovation

Once companies gain a foothold in the market, they can improve their ability to educate more students per class and march upmarket into higher enrollment classes.

FORBES: Defining Performance In Disruptive Innovation

Even prison classes are selective in their enrollment.

FORBES: Mortgage Brokering Taught in Prison

The latest idea, to be voted on in May, would create a student count, for the purpose of assigning classes, by taking the actual enrollment, and then adding the number of athletes who live outside their school district boundaries, or attend a public school outside their high school district boundary (for those students attending, say, a magnet or charter school outside their neighborhood).

FORBES: States Strain For Creative Solutions To High School Sports Class Warfare

Many business schools expect open-enrollment courses--ready-made exec-ed classes offered throughout the year--to be hurt by the downturn.

FORBES: The Business School Beat

Enrollment in the gifted and talented program is a coveted prize, providing advanced classes for the select group of children who qualify.

WSJ: Big Change in Gifted and Talented Testing