In designing HDxPRT, we put a lot of emphasis on finding a natural way to evaluate user experience in the usages HDxPRT measures. The first step in determining a natural way to evaluate experience was to identify the natural units of work. The natural work units for media usages are typically based on the event captured in the media, the device used, or the output of the creation process. Some examples are – “Videos from my Camcorder”, “Photos from last vacation”, “Photos from the memory card in my digital camera”, “Photos for my Facebook* album”, “Music from my CD collection”, and “Music for my iPod*”. We used this approach in HDxPRT to define the usages in our workloads. In addition to the usage description, we used commonly understood device specs to describe our workloads even more objectively. Example – “Vacation memories from 10 Mega-pixel Digital Camera with 4GB memory”. Once we identified the natural work units, it was clear to use that time was natural metric for the create usages in HDxPRT. For measuring HD Playback experience, we continue to use the quality of experience rating system we created for Intel® DHCAT.