Categorizing and Prioritizing Telephony Features. - Patsy Ann Zimmer; Joanne M. Atlee (FIW, 2005)

Prioritizing Features Through Categorization: An Approach to Resolving Feature Interactions. - Patsy Ann Zimmer (2007)

Ordering features by category. - Patsy Ann Zimmer; Joanne M. Atlee (J. Syst. Softw., 2012)