In order to develop the proposed catalogue by composing a reusable and conceptual
NFRs models base for ubisystems, we concentrated our efforts – respecting the NFR
Framework notation – on three activities: NFRs elicitation; NFRs decomposition; and
NFRs Interdependencies identification. These activities started from ubiquitous scenarios
and the quality criteria identification obtained in the State-Of-The-Art, experts
consultation, and during our experimental research. The elicited NFRs were evaluated
with the user’s participation, and then evolved. These activities were iteratively performed,
which allowed us to incrementally construct our knowledge base through the
following phases: