Here's what this means in practice: Ms. Alvarez, Mr. Burns, and Mrs. Coleman are 4th grade teachers in a school. They are all eligible to participate in the project if the principal would be willing to assign any of them to teach any of the three 4th grade classrooms to which they would usually be assigned. Effectively, if next year the principal would approve a switch of classrooms among Ms. Alvarez, Mr. Burns, and Mrs. Coleman, then Ms. Alvarez, Mr. Burns, and Mrs. Coleman are eligible to participate.

Here's another example: Ms. Valentine, Mr. Washington, Mrs. Yassky, and Ms. Zarini are the 9th grade math teachers in a school. If there are both advanced and standard-level math classes in the school, Ms. Valentine, Mr. Washington, Mrs. Yassky, and Ms. Zarini are eligible to participate in the project if the principal would be willing to assign any of them to teach any of the ninth grade math classes in the school, regardless of whether it is an advanced or standard-level course. Effectively, if next year the principal would approve a switch of classrooms among Ms. Valentine, Mr. Washington, Mrs. Yassky, and Ms. Zarini, then Ms. Valentine, Mr. Washington, Mrs. Yassky, and Ms. Zarini are eligible to participate. The critical point here is this: If the principal believes that only Ms. Valentine has the appropriate experience to teach the 9th grade advanced-level math class, then only Mr. Washington, Mrs. Yassky and Ms. Zarini would be eligible to participate, and only their standard-level math classes could be assigned through the lottery process.