Found some research around measuring User-Trust.
• First, developers can learn that trust concepts can be operationalized into specific attributes or questions that can be examined in research and designs.
• Second, one of the key findings is that trust seems to be related to beliefs about another’s ability, integrity, and benevolence.
• Third, trust and risk are related concepts, and factors that reduce risk perceptions, such as reducing uncertainty, can be beneficial for increasing trust or decreasing the need for trust.
• Fourth, ease-of-use characteristics, such as the ease of finding information and completing transactions, can affect trust.
• Fifth, external factors or context that may seem to be unrelated to the situation can affect trust, such as the characteristics of the truster and the type of risk involved in the transaction.
• Finally, trust probably develops in stages. In the first stage, superficial interface properties, such as colors and designs, can have a large effect on initial trust decisions. Later, users may make trust decisions based on more reasoned analysis of information. Eventually, long-term trust decisions are based on direct experience and personal service.