Identify one specific nursing theory that relates to mental health

Identify one specific nursing theory that relates to mental health.  Feel free to go to the Currents website or look in your textbook for multiple nursing theories to choose from http://currentnursing.com/nursing_theory/Links to an external site. Discuss the type of the selected nursing theory according to scope (meta-theory, grand, middle-range, or practice theory) and purpose (descriptive, explanatory, predictive, or prescriptive).