When you throw a pebble into a pond, you’ll see a splash and hear the resounding plunk of the pebble. You might notice concentric circles rippling out from the locus point of where the pebble hit the water. The thrown pebble might also have other effects. It might frighten a nearby duck that leaps out of the water, hit another rock and bounce off, or scare a bunch of fish as it sinks into the pond. You are connected to the pebble, the water and the effects of throwing by the ripples the duck, and the fish. You have caused change through a single and simple act. In education, this concept is known as the ripple effect.

A classwork management theorist named Jacob Kounin coined the term ripple effect in 1970 to describe the positive effect teachers may exert on students. According to Kounin, the ripple effect occurs when a teacher asks a student to stop a distracting or destructive behavior. Kounin observed that when a teacher asked a student to stop a behavior in front of the rest of the class, this had a ripple effect on all other students in the class. This engagement made other students who might not be paying careful attention to also stop distracting behaviors, thus promoting better class control.

Kounin suggested that failure to reprimand a student for poor behavior in class caused a negative ripple effect. If one student could misbehave without being told publicly to stop, this gave other students license to misbehave. Through his studies, and his 1970 book Discipline and Group Management in Classrooms, Kounin advocates for understanding the ripple effect in order to achieve a more disciplined classroom.

Just as the pebble thrown into the pond might have negative unintended consequences, like frightening the duck and the fish, so can the ripple effect, when injudiciously applied by teachers. Students who have behavior problems due to persistent learning disabilities or medical conditions may be negatively affected by having their faults discussed publicly on a frequent basis. A student who is subject to frequent reprimands might be socially challenged and marked out by other students as different or simply disliked by others. Studies since Kounin’s work suggest teachers need to be aware of the possible negative ripples produced by public reprimand.

The ripple effect is also a term used in sociology, economics and in many other fields to discuss how the behavior or occurrence of one thing can have an effect on many things. For example, an article in the January-February 2007 Duke Magazine discusses the ripple effect of the Iraq war on the American people. The article, “War’s Ripple Effect,” suggests that the Iraq war becomes more personalized when people actually know soldiers who have either been killed or injured in the war. This, in turn, may shape public opinion regarding the benefits of continued engagement in Iraq.

Economists might use the term ripple effect to describe the effect of low wages on a housing market, or of a depressed housing market on interest rates. In all, the ripple effect asserts that actions always have consequences, either for good or ill. No action is without reaction, and the ripples, in some cases, may be far-reaching.