Describes a technique to make multistage cluster sampling easier for students to understand. Explains that students handle concrete objects that are analogous to the sampling units of a multistage cluster sampling procedure. Suggests that this method is inexpensive, easily organized, and stimulates the tactile senses in the learning process. (DK)

At Park Senior High School (Cottage Grove, Minnesota), 46 juniors and seniors planted 384 red pine seedlings in connection with their original research on acid rain, with advice from Dr. Harriet Stubbs, director of the Acid Precipitation Awareness Program (West Saint Paul), which has been developing acid rain teaching materials. (MH)

Discusses how clinicians and researchers can critically evaluate information from efficacy studies of language intervention programs. It argues for combining both experimental and nonexperimental approaches and suggests that the use of matching in nonrandomized studies allows for comparison of groups of children participating in an intervention…