15 children per staff —Staff:child ratio recommendations for 3-5 year olds by daycare lobby OECD, Martha Friendly et al

15 children per staff—Staff:child ratio recommendations for 3-5 year olds by daycare lobby OECD, Martha Friendly et al June 2009. Martha Friendly. Childcare Resource and Research Centre - research paper (PDF): "Ratios for four and five year olds: What does…