Working models help guide behavior by allowing children to anticipate and plan for caregiver responses.

First, how are the thoughts that form working models organized in the mind?

Second, how stable are working models across time?

There were working models by 1987, but the system was finally killed, in part by political in-fighting.

Most people work on 1964 and later models.

We've got working models of the pirates' instruments, so you can figure out their patterns and formulas.

Some were working models, made of wood and iron.

The team subsequently worked on developing further, more advanced models in 1944 and beyond.

Working models began to appear in the 16th century.

Working models are not required for patents, merely drawings and descriptions.