The subject of this booklet is cross-age helping. It begins with a discussion of what cross-age helping is and why it is effective. Cross-age helping is described as a program where children teach or help other children. The older children help the younger children learn what the younger children want to know, and the younger children help the older children use their knowledge. The next section looks at some specific programs and tells what made them successful, and how they worked. There are descriptions of some summer programs and of a sixth grade to junior kindergarten program. The next section of the booklet lists some of the problems to watch out for when having older children helping younger children. The following section is a discussion of the key elements needed in an effective program. These basically concern attitudes of teachers and students involved and scheduling. The final section gives examples of other types of cross-age tutoring projects. A brief summary and references are included. (RC)