This chapter has presented the personnel, infrastructure and data issues associated with improving the maintenance, availability and reliability of offshore wind farms. The key factors are shown to be the training of staff, the availability of appropriate access infrastructure and the presentation of appropriate data from the wind farms to those staff to allow that costly infrastructure to be fully exploited. A proposal has been presented for an Offshore Wind Farm Knowledge Management System to handle the SCADA and CMS monitoring data and the accumulated reliability data of the wind farm correlating it with the maintenance logs to provide an integrated system upon which maintenance planning can proceed.