Author: Ritch Macefield

Macefield, Ritch (2009): How To Specify the Participant Group Size for Usability Studies: A Practitioner's Guide. In Journal of Usability Studies, 5 (1) pp. 34-45. https://www.upassoc.org/upa_publications/jus/2009november/JUS_Macefield_Nov2009.pdf

Macefield, Ritch (2007): Usability studies and the Hawthorne Effect. In Journal of Usability Studies, 2 (3) pp. 145-154. https://www.upassoc.org/upa_publications/jus/2007may/hawthorne-effect.pdf