document: The union said it was as a result of concern about a range of issues including staffing levels, shift patterns and pay.
  General secretary Mick Cash said the RMT would be working with sister unions.
  Last month, GMB Scotland announced that a consultative ballot on possible strike action by North Sea contract workers was to be held.
  The Offshore Contractors Association previously said it was a challenging time for the North Sea oil and gas industry.
summary: The RMT union is to ballot offshore members over industrial action.