Avant STAMP for ASL uses full motion video for both Receptive and Expressive skills, which requires a strong network connection and a current computer. A computer camera will be required for the signing-Expressive portion of the test. Avant STAMP for ASL is currently compatible with only the Chrome browser (the latest version) on PCs, Macs and Chromebooks. Please see our Assessment Technology Guide for overall system, equipment requirements, and browser capabilities.