Question

how may psychology be understood as both science and art

Answer 1

There are three main areas of employment in psychology — research, teaching and practice.

The research aspect is most scientific, but the practice aspect is more artistic, with teaching somewhere in between.

Does that help?

Answer 2

i said it is an art in the sense that applied, especially clinical psychology is not carried out by the mechanical application of techinique, but requires experience, judgment, and intuition on the part of the practitioner.