Self-report Disguised Non-verbal Physiological
self-report
VALIDITY Reactivity biases May not tap Often, good. Be May not tap
(demand construct. wary of construct.
characteristics However, observer biases. However, free
and social relatively free from some
desirability), from reactivity reactivity
and response sets biases and biases and
may pose observer biases. often free from
problems. observer biases.
However,
generally
reliable and
often has good
validity.
SENSITIVITY GOOD Often, poor Sometimes hurt Sometimes hurt
because measure by limited by poor
is affected by range of scale reliability.
so many other points or by
factors poor
reliabi-lity.
SCALE OF Interval? Ordinal Often, ordinal Often, ordinal
MEASUREMENT
ETHICS Good. Raises informed Depends. Usually okay.
consent Privacy issues
problems. may be raised.
PRACTICAL Good. Okay. Depends, may be Usually fine.
too difficult Expense may be
a problem