  A journal set in an interdisciplinary or newly developing area can be
determined by including the journals classified under the most relevant ISI
Subject Categories into a journal-journal citation matrix. Despite the fuzzy
character of borders, factor analysis of the citation patterns enables us to
delineate the specific set by discarding the noise. This methodology is
illustrated using communication studies as a hybrid development between
political science and social psychology. The development can be visualized
using animations which support the claim that a specific journal set in
communication studies is increasingly developing, notably in the "being cited"
patterns. The resulting set of 28 journals in communication studies is smaller
and more focused than the 45 journals classified by the ISI Subject Categories
as "Communication". The proposed method is tested for its robustness by
extending the relevant environments to sets including many more journals.
