  A decision procedure implemented over a computational trust mechanism aims to
allow for decisions to be made regarding whether some entity or information
should be trusted. As recognised in the literature, trust is contextual, and we
describe how such a context often translates into a confidence level which
should be used to modify an underlying trust value. J{\o}sang's Subjective
Logic has long been used in the trust domain, and we show that its operators
are insufficient to address this problem. We therefore provide a
decision-making approach about trust which also considers the notion of
confidence (based on context) through the introduction of a new operator. In
particular, we introduce general requirements that must be respected when
combining trustworthiness and confidence degree, and demonstrate the soundness
of our new operator with respect to these properties.
