- Existing user input sampling methods used for stress-related psychotherapy are plagued with problems of low recall accuracy and high intrusiveness. In this paper, we propose a contextual recall-based self-report method using mobile sensing technology that captures contextual cues including location, activity, and environmental acoustics to aid accurate recollection of stress levels. We conducted a controlled study with 36 participants. Our experimental results suggest that contextual recall outperforms recall-based self-report method by both increasing the recall accuracy and minimizing intrusiveness to participants at the same time. Moreover, we quantified the contribution of each individual contextual cue in recollecting stress levels. We found that although participants perceived all of the contextual cues to be useful, in reality, not all the contextual cues are weighted equally during the recollection process.