open-systems
open-top
opentop
open-type
operability
operand
operating
operating-procedure
operation
operationability
  operational
operationally
operation-one
operation-performing
operation-routing
operation-terminating
operative
operator
operator-activated
operator-controlled
operator-entered

    operational safety

     безопасность труда

     надёжность в работе, безотказность в работе