We strongly recommend undertaking network mapping workshops: two to three hour sessions that enable a group of people connected to an organization or campaign to brainstorm networks in an open manner. These allow everyone to contribute their ideas, connections and channels in a way that will help maximize campaign engagement.
These workshops are not particularly hard to deliver, but ideally you will want to train key staff in running them, so they can be repeated several times to ensure maximum network exposure. Typically, organizations will have several constituent groups who can help with network mapping - e.g. trustees, fundraising staff, the campaign team, directors, focus groups, etc.
Once you have mapped influencers, you should also run bottom-up network mapping, focusing on key subsets of potential "public" support for the campaign - e.g. those who are likely to give $500 or less but the vast majority of whom may not be within your inner circle. This builds the "money table" for the campaign (mentioned earlier), and will help us to simulate the campaign and generate suggested targets.