User Testing a Programming Language: Experience and Methodology. - Adriane M. Donkers; Marta Arnaldo; Richard Dillon; Jo W. Tombaugh (ACM SIGCHI Bull., 1991)

Observer accuracy in usability testing: the effects of obviousness and prior knowledge of usability problems. - Adriane M. Donkers; Jo W. Tombaugh; Richard F. Dillon (CHI Posters and Short Talks, 1992)

Usability testing: is the whole test greater than the sum of its parts? - Alice Y. K. Wong; Adriane M. Donkers; Richard F. Dillon; Jo W. Tombaugh (CHI Posters and Short Talks, 1992)