One disjointed or boring sentence can kill the mounting enthusiasm of a tired grant reader. Maintain a tempo of easy to understand sentences that build on one another in a crescendo fashion. Show in your proposal that you're aware of who has done similar projects, and that you've partnered with appropriate entities to assure your project will have enough support to make it through to completion. Affiliating with BST gave the impression that the grantees will have technical telecommunications support to assure their grant's success. Most of these grants never included funding for BST, they simply listed us as a knowledgeable partner.
Sustainability is a big issue.
Too many grant projects disappear after the funding is gone. How can you assure ongoing benefits once the funding runs out is one of the biggest questions in the mind of the grant reviewer. In the passion of writing a grant it is easy to get too ambitious. A major red flag for grant reviewers is the indication you've planned to accomplish more than your budget makes realistically attainable. It is better to limit your proposal to less, more assuredly attainable goals, than to promise more than you can deliver.