As Clean Sky approaches its mid-term, the programme focus will start to shift towards consolidating the most promising technologies that have been down-selected into the major demonstration efforts. The Clean Sky Technology Evaluator (TE) is also coming into its own with the first assessment of the Programme's progress towards its environmental goals recently completed. A powerful tool is now in place to help inform the Members and external stakeholders of Clean Sky's benefits, and guide decisions for future optimization of research efforts. This special edition of Skyline informs you about the unique process followed and the general outputs of the first assessment, which confirm that Clean Sky is on track to achieve its objectives.