It has been proposed that an insight is crucial to make creative product. However, there is no
consensus yet what makes it and its process is. Moreover experimental research focused in this topic has
reported controversial results. This study examined what makes this controversial results. The authors
argued that these controversial ones were caused by using pure-insight problems and by one-step
experimental procedure. This study proposed that it would be considered using hybrid-insight problems
involved both perceptual functions and domain-related knowledge or strategy. In addition, two-step
procedures would be better to confirm the difference between experimental and control group. These two
proposals on this study may let the controversial results reconcile with.