In sum, the ASK-20 is a generic measure of barriers to
treatment adherence that has demonstrated reliability
and validity in this psychometric analysis. Unlike most
previous measures of treatment adherence, the ASK-20
assesses not only adherence behavior, but also a range
of potential barriers to adherence. Future research on the ASK-20 can continue to refine and validate the
instrument, while assessing its usefulness across a
wide range of settings and patient populations