Beyond high-level, broad-strokes data, there’s little information available about patterns in funding for nonprofit organizations. As a result, philanthropists and nonprofit leaders have little choice but to make assumptions about funding. One common assumption: Having a variety of sources makes for a healthier organization. And a preliminary study of a small number of youth-services and environmental-advocacy organizations suggests this assumption may be true to some extent but it doesn't paint the complete picture.  The research found clear differences in the typical funding mix of organizations depending on their size. Patterns such as these could provide important guideposts for nonprofits that want to build robust economic models.