This is the 2007 version. Click here for the 2017 chapter 10 table of contents.

The Concrete Operational Period (5-12)

Suddenly, around the age of 5 to 7, the average child catches on to the conservation experiments. This marks the transition to a new stage of development: the concrete operational period. Now the child can understand simple operations performed on concrete reality: operations like pouring a beaker of water from one vessel to another.

What happens at the beginning of the concrete operational period?

Why does the child suddenly pass the same tests he or she failed a year earlier? Piaget felt the child had jumped up to a new stage of development. The child now has a mental representation or schema for liquid quantity, mass, number, and other such concepts. Some conservation problems are easier than others, but within a year or two they are all mastered. In fact, the child now finds these problems so easy that he or she is likely to wonder why an adult is asking such silly questions. "Of course the two beakers have the same amount of liquid in them..."

What explanations did Piaget accept as indicating true understanding?

Piaget and his co-workers did not call a child a conserver until the child could explain the conservation experiment. This guarded against children learning to say, "Yes, they are equal" in conservation experiments, without really understanding what was going on. Piaget identified three types of explanation that he considered good evidence of true understanding by the child:

1. Reversibility ("You can put it back like it was.")

2. Compensation ("It's taller but it's also skinnier.")

3. Identity ("You didn't change it; it's still the same.")

Write to Dr. Dewey at

Don't see what you need? Psych Web has over 1,000 pages, so it may be elsewhere on the site. Do a site-specific Google search using the box below.

Custom Search

Copyright © 2007-2011 Russ Dewey