To use Title I funding in other than schoolwide projects, an extended-time program must meet the special educational needs of educationally deprived, Title I-eligible children, and services must focus on these recipients. However, non-Title I children may also participate under a federal regulation that allows for the "incidental inclusion" of other students if excluding them is "impractical" and if their inclusion does not exclude Title I students from the program, increase the program's cost, or decrease the amount, duration, or quality of the service (34 CFR Part 200). In fact, most Title I-funded extended-time programs are offered at public school sites, an arrangement that could make it difficult to exclude non-Title I students who may want to participate. The incidental benefit rule supports some effective instructional practices, such as heterogenous grouping and cooperative learning.