Many teacher readers of Yardsticks: Children in the Classroom Ages 4-14 make particular use of the book at this time of year by referencing Appendix A, beginning on page 195 in the third edition. There they find “The Birthday Cluster Exercise,” a practical way to get a rough idea of the developmental range and “cluster age” of the new class before them.

Whether teaching kindergarten or fifth grade, it’s important to know as much as possible about each individual child, but it’s also crucial to have a good sense of where the class in general is functioning socially, academically, physically, and in their overall development. Although chronological age is only an approximate measure of developmental growth, it does help us get a picture of the class, just as it helps us get a picture of an individual child.

If you want to try this birthday cluster exercise but don’t have a copy of Yardsticks,create a chronological listing of your class from oldest to youngest by years and months–for example, 10.11, 10.9, etc. With this listing, you can see right away the range of chronological ages you’ll be teaching.

Once you’ve created your list, you’ll want to establish the mode of the class–the place where most birthdays cluster.

Now that you’ve got range and cluster information to give you a sense of how old this class is, what will you plan for?

Take a fifth grade class beginning the year with mostly solid 10-year-old developmental characteristics, for instance, as a cluster. There are a few nine-year-olds, but overall, this is an older class that will turn eleven together during the year. Consider the classroom implications for ten-year-olds. Think about your room arrangement, what curriculum activities will most engage this class as a whole, and potential problem areas, especially socially, for the much younger children in the classroom, as well as for the one or two who are already eleven.

Consider how the class will be different in the second half of the year, when most (nearly three fourths by March) of the children will be exhibiting eleven-year-old developmental characteristics. Much different behavior ahead! You’ll need to respond to the shifting development by adjusting approaches to classroom organization, instruction, classroom responsibilities, homework, and many other areas of classroom life.

Teachers (and parents, too) who don’t pay attention to the development shifts within a given year often wonder why they have more trouble with a class (or their child) seemingly all of a sudden in the second half of a school year. Conversely, teachers may comment about how pleased they are with how much the children have grown under their tutelage, when some of what they’re seeing is the result of normative development shifts.

Giving more attention to developmental considerations is bound to help any teacher make a little more progress with a class as a whole and to help a parent understand and nurture their particular child a little better. Have you had an eye-opening experience when you thought about developmental shifts for a class or a child? Share your discoveries!