  Users increasingly face multiple interface features on one hand, and
constraints on available resources (e.g., time, attention) on the other.
Understanding the sensitivity of users' well-being to feature type and resource
constraints, is critical for informed design. Building on microeconomic theory,
and focusing on social information features, users' interface choices were
conceptualized as an exchange of resources (e.g., time), in return for access
to goods (social information features). We studied how sensitive users'
well-being is to features' type, and to their cost level and type. We found
that (1) increased cost of feature use leads to decreased well-being, (2)
users' well-being is a function of features' cost type, and (3) users'
well-being is sensitive to differences in feature type. The approach used here
to quantify user well-being derived from interface features offers a basis for
asynchronous feature comparison.
