Torrance Tests of Creative Thinking

The Torrance Tests of Creative Thinking (TTCT) were developed in 1966 by Ellis Paul Torrance as a measure of creativity. It was a benchmark method for quantifying creativity. Building on J.P. Guilford's work, they involved simple tests of divergent thinking and other problem-solving skills, which were scored on four scales:
 * Fluency. The total number of interpretable, meaningful, and relevant ideas generated in response to the stimulus.
 * Flexibility. The number of different categories of relevant responses.
 * Originality. The statistical rarity of the responses.
 * Elaboration. The amount of detail in the responses.

The third edition of the TTCT in 1984 eliminated the Flexibility scale