Based on my experience with the trust-building challenge, I have structured and formalized an approach that I found particularly successful when applied early on in defining marketing plans, here it is in a nutshell: it comes from putting together what has worked in the past (if there is some history) or similar experiences in the same industry and group every initiative into a “formula” that delivers consistently on the objective of building and sustaining trust.
I borrowed the structure from the well-known and widely implemented three-factor authentication wireframe: something you know, something you have, something you are and I added to this an overarching result-enhancer that is communication.
Therefore, the trust formula assumes you succeed in building trust by communicating consistently over time something you know, something you have and something you are.