Wide support for having all inmates in fulltime work or study before 2017.
Labour and the Greens are backing National's plan to get all prisoners working or studying fulltime within three years.
If re-elected, National has promised to turn all 16 of New Zealand's public jails into "working prisons" before 2017 and to introduce a new drug addiction treatment scheme for ex-prisoners.
Corrections Minister Anne Tolley said the working prisons would require inmates to have structured 40-hour weeks, which could include fulltime work, skills training, educational courses or rehabilitation.
If prisoners refused to work, they could be penalised when they came up for parole, or in other ways.