Language learning can only advance with practice and corrective feedback. The interactive system, SignTutor, evaluates users' signing and gives multimodal feedback to help improve signing.
Aran, O., Ari, I., Akarun, L., Sankur, B., Benoit, A., Caplier, A., Campr, P., Carrillo, A. H., & Fanard, F.-X. (2009). SignTutor: An Interactive System for Sign Language Tutoring. IEEE MultiMedia, 16(1), 81-93. https://doi.org/10.1109/MMUL.2009.17 (Original work published 2009)