Similar/Dissimilar Maker

Sub Trajectory: Classification

By 18 months, forms sets in which objects in each set are identical and objects in the other sets are different, and by 2 years, intuitively forms groups with objects that are similar on some attributes (may be mixed and inconsistent), but not necessarily identical. May use functional relationships as a basis for sorting. 


You may see this:

Linked Image to Sign In/Sign Up page

Other Examples:

  • In play, puts several red toy animals together, and then sees several red cats, so puts other cats with them regardless of the color.


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Special Thanks To

Institute of Education Sciences
The research reported here was supported by the Institute of Education Sciences, U.S. Department of Education, through grant numbers R305K050157, R305A120813, R305A110188, and R305A150243. to the University of Denver. The opinions expressed are those of the authors and do not represent views of the Institute or the U.S. Department of Education.