This is an AMAZING book, well researched, easy to read, about why you should combine data and narratives, and some strategies for doing just that. WARNING: The book is written for data scientists and the author, the wonderful Brent Dykes, spends the first half of the book helping them understand why they should use data inside a story and with personal narratives - rather than just presenting a bunch of numbers! As a nonprofit leader, you might want to start at Chapter 4 (all the chapters are described in the link). I incorporate a lot of Brent's work ImpactStory™ Group Coaching.