This document presents the analysis carried out as part of NEXUS deliverable D1.1 ‘Development trends of offshore wind industry and effect on cost aspects’. The main aim of this deliverable is to collect heterogeneous data, concerning the operation of offshore windfarms, preparing the appropriate input for the subsequent WPs of the project. This input covers the past, current and projected information as well as main industry challenges in relation to operations and maintenance, novel vessels and equipment, and logistics of offshore wind. More specifically, the objectives are to analyse the development trends of labour and energy market, different parameters effecting on cost of energy for offshore windfarm, and asset operation and wind turbine maintenance particulars. Additionally, this deliverable investigates different vessel types currently employed in offshore wind projects, and relevant vessel technologies. Furthermore, important operating tasks and market overview of offshore wind turbines and their foundations have been identified. Extensive research targeted the vessel market of Service Operation Vessels (SOVs) incorporating technical features and characteristics, design requirements, operating conditions, and the projected numbers of expected vessels’ requirements. According to International Renewable Energy Agency (IRENA) energy employment records, increase in employment of wind energy industry has been identified since 2012. This energy growth has been demonstrated at the global cumulative wind capacity power during 2005- 2013 from 59GW to 318GW respectively. On the other hand, the global annual installed wind capacity in 2005 was 12GW, whereas in 2013, 36GW. Moreover, the global cumulative offshore wind capacity has been demonstrated among UK, Germany, Denmark, China, Belgium and the Netherlands. However, China uses mainly domestic supply chain and a lot of the wind energy installed is currently offline. Regarding the installation and operating conditions, water depth, average wind speed, and distance to construction port have been examined for crucial offshore wind energy markets such as the UK, France, Denmark and the Netherlands. Additionally, in similar aspects extensive investigation and comparative figures have been demonstrated between European and Asian market.