Becky Calzada writes: “It’s School Library Month, and this year we mark the 40th year of celebrating school libraries and school librarians. In his book Visible Learning, New Zealand researcher and educator John Hattie stated, ‘My role, as teacher, is to evaluate the effect I have on my students. It is to know thy impact, it is to understand this impact, and it is to act on this knowing and understanding.’ Each and every day, I see, hear or read of these actions happening in school libraries across the country.”