A key element of Sustaining Progress is that payment of 75% of the benchmarking increases and all of the general round increases will be made only if satisfactory progress is verified in regard to the commitments in the chapter entitled "Delivering Quality Public Services". This means co-operation with flexibility and ongoing change, satisfactory implementation of the agenda for modernisation and the maintenance of stable industrial relations. The central feature of the arrangements to verify that the conditions for the payment of these increases has been met is the establishment of performance verification groups for each sector of the public service. These groups will make an assessment of progress no later than one month before each of the four payment dates specified in the agreement. These assessments will be made in respect of agreed action plans for each organisation derived from the commitments in the agreement, which have been agreed by each performance verification group, as well as on an assessment of progress achieved in the relevant sector provided to the performance verification group by the Secretary General responsible.