A Day is a Thousand Social Contracts
Many years ago I was a part of a distributed project team designing a workshop that combined teambuilding, with systems thinking and sustainable development. It was lead by Dennis Meadows, one of my mentors, and at one early point in our process where we were taking on individual roles and responsibilties, he asked us to distinguish between "wish to do" and "will do". At that time, I am not sure I fully appreciated his request. It really does have to do with teamwork and the systems in which we work.
Committing yourself to do something already demonstrates good intent and some level of trust on your part, however, actually delivering on your commitment starts to build it within the team. Social contracts, the promises we make to others every day, when they are honoured (as the norm) help to build trust around us and creates an environment which supports achievement, where we might be able to take some risk and try new and innovative things. The inverse is also true, non-delivery on commitments starts to chip it away. One way to build trust is to be clear about the difference between what you want to do/intend to do/hope you have time to do and what you will do. And then to absolutely do it.
This question of trust building is not just about being nice. It is also about getting things done. When I trust you to do something, I am taking risk to build my productivity and outputs on the inputs of others. The quality of my work and effectively my reputation, then becomes more collectively based on the contributions of many other people. In order to do this I need to trust that others will honour their commitments to me, so that I can do a good job. The alternative to this is that I base my outputs solely on my own work (or that of an immediate team that I control with financial or other strong incentives like performance assessments) . What more might I accomplish if I opened myself to the diverse inputs and talents of a much larger "team"?
The theory in teambuilding is that a high performing team (trust comes in here) can accomplish things that it is difficult or impossible for an individual to do alone. In systems, one goal is to find the interrelationships that already exist and leverage those in order to help achieve a much larger collective goal. And to get people to work beyond their immediate functional units (sometimes called "silos") takes trust. One place to start building trust is making good on social contracts so people can count on you. It is also about knowing when to say "I can't do this right now"; which of course is another essential team skill (for some an even harder one).