This definition appears very rarely
:189 Officer training became a priority under Campbell's administration, from the late 1960s. Training courses were set up for staff inductions and promotions, and seminars were started for senior officers. :58, 61 The most significant change in this period, however, was that prison officers achieved representation through the Western Australian Prison Officers' Union. :189 The strength of the union was based on the ability to almost cripple the prison system through strike action, first taken in 1975.