According to Guilford's Structure of Intellect (SI) theory (1955), an individual's performance on intelligence tests can be traced back to the underlying mental abilities or factors of intelligence. three dimensions of intelligence postulated by Joy Paul Guilford to underlie individual differences in scores on intelligence tests, namely, contents, operations, and products. Each mental ability represents a combination of these three facets. Guilford (1959) identified five key elements of creativity: fluency, flexibility, originality, awareness, and drive. Understanding these elements removes some of the mystery surrounding creativity and paves the way for encouraging its growth.