SUMIF no error, but returns '0' vs. actual sum


I'm using the Sum =SUM(CHILDREN()) to capture scoring of items by various teams, which is working great for each tool/category, but I want to now show a score by team (not just overall total by tool). 

=SUMIF(Tool6:Tool187, "Development", [Key factor]6:[Key factor]187) - this results in '0' (should be 35)

Summing a number in the Tool column / where 'Product' is found in Key factor column

I've tried variations of the above but get various errors.  I'm sure I'm overlooking the obvious but kind of stuck at this point.  thanks



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