Classification of usability problems (CUP) scheme: augmentation and exploitation. - Sigurbjörg Gróa Vilbergsdóttir; Ebba Thora Hvannberg; Effie Lai-Chong Law (NordiCHI, 2006)

Assessing the reliability, validity and acceptance of a classification scheme of usability problems (CUP). - Sigurbjörg Gróa Vilbergsdóttir; Ebba Thora Hvannberg; Effie Lai-Chong Law (J. Syst. Softw., 2014)