When an individual is taking steps to modify his or her behavior to solve a problem, he or she is considered to be in what stage?

Answer: action

Explanation:

According to Prochaska and Norcross, change is not a linear progression through different stages, but five stages people move through in a spiral pattern: pre-contemplation, contemplation, preparation, action, and maintenance.

Action is the stage in which people change their behavior to solve a problem. Action requires the strongest commitment of time and effort, and the results tend to be the most visible and externally recognized.