The Board does accept proposals for phased projects but there are some things to consider. Each funding round, the Board receives requests for more money than it has to give out, meaning each round is competitive. When evaluating applications, the Board does not give more weight to proposals from previously funded organizations or for additional phases of previously funded projects. Because of this, funding for multiple phases is never guaranteed. When planning for your project, keep this in mind and treat each phase as an isolated project in its own right, even if part of a larger, ongoing project.
Your proposal should indicate a beginning, middle, and end, and should identify quantifiable goals and outcomes for that particular phase. The security and care of your collections should not be dependent solely upon continued, phased funding, and you should build in safeguards for delays or pauses that might come as a result of not getting funding.
Lastly, as you compose your application, do not assume that the person reading your application has any prior knowledge of your project. Board terms expire on a three-year cycle and are staggered, so in any given year, there is likely to be 1-3 new Board members reading your application. You will need to provide all relevant background information, demonstrate your previous successes, and explain in detail your plan for the proposed phase.