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Recently an impressive development in immersive technologies, such as Augmented Reality (AR), Virtual Reality (VR) and 360°video, has been witnessed. However, methods for quality assessment have not been keeping up. This paper studies quality assessment of 360°video from the cross-lab tests (involving ten laboratories and more than 300 participants) carried out by the Immersive Media Group (IMG) of the Video Quality Experts Group (VQEG). These tests were addressed to assess and validate subjective evaluation methodologies for 360°video. Audiovisual quality, simulator sickness symptoms, and exploration behavior were evaluated with short (from 10 seconds to 30 seconds) 360°sequences. The following factors' influences were also analyzed: assessment methodology, sequence Manuscript received

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