Psychosocial Impact of Assistive Devices Scale

PIADS measures psychosocial impact — how the device changes the user's sense of competence, their adaptability and willingness to participate, and their self-esteem. Satisfaction measures like QUEST ask whether the user is happy with the product and its provision. A user can be satisfied with a device that nonetheless does little for their confidence, or dissatisfied with one that genuinely improved their psychosocial functioning. PIADS targets the impact on quality of life, which is often the ultimate justification for providing assistive technology, and it can detect negative as well as positive impact.

The three subscales are competence (twelve items on efficacy and usefulness), adaptability (six items on willingness to try new things and participate), and self-esteem (eight items on emotional well-being and confidence). Splitting impact this way reveals the pattern of effect: a device might raise competence by restoring a function yet have little effect on self-esteem, or chiefly boost adaptability by enabling new activities. The profile across the three dimensions is more informative for understanding and improving the match between device and user than a single overall impact score.

PIADS items are rated from minus three to plus three with zero meaning no change. The bipolar design lets the scale record that a device can decrease, not just increase, competence, adaptability, or self-esteem — for example a stigmatizing or poorly fitted device that makes the user feel less capable or more self-conscious. A scale that only ran upward would assume all devices help and would miss harm. The zero anchor also provides a clear reference for devices that have no psychosocial effect at all.