From SAMHSA -
(Although developed in regards to SAMHSA grants, the following manual has pieces applicable to all grant applications)
Includes tips such as: organizing your internal program and organizational materials, having partnerships, leveraging coalitions, reviewing eligibility and capacity, and establishing timetables.
Access here > https://www.samhsa.gov/sites/default/files/developing-competitive-samhsa-grant-application-manual.pdf
