HTTP adaptive steaming (HAS) is becoming ubiquitous as a reliable method of delivering video content over the open Internet to a variety of devices fromBy introducing various network impairments, we were able to demonstrate that video quality gracefully declined until network conditions became too harsh. As a baseline, we compared them with the Microsoft Mediaroom* Internet Protocol television (IPTV) solution currently deployed by service providers. The HD content was encoded at 6.0 Mb/s.The second approach was to create several clips in which exaggerated errors (such as visual artifacts) typical of HAS were introduced on purpose. These were shown to a much wider audience than we could bring into our test labs. Specifically, we used 150 volunteers from the Alcatel-Lucent Youth Lab to offer their subjective assessment of several pieces of content.From these experiments, we conclude that HAS is suitable for delivery of quality video over unmanaged IntroductionHTTP adaptive steaming (HAS) is becoming ubiquitous as a reliable method of streaming video content over unmanaged networks to a sizable number of classes of devices including smartphones, tablets, laptops and desktop personal computers (PCs) connected to small and medium-sized screens. It achieves this by dynamically adjusting the video quality to match the available bandwidth. This paper reports on two approaches to end user subjective testing of response to these changes in quality.The first approach was to invite a panel of viewers into our test lab facility. They were asked to rate high definition (HD) video content displayed by commercially available HTTP adaptive streaming solutions including Microsoft Smooth Streaming, Apple HTTP Live Streaming, and Adobe Dynamic Streaming.