Yato si awon iwe, won tun sagbejade ewi, ere, ati awon iwadii.. 
Awọn igbesẹ bii pipa ṣiṣan owo ile-iwe rẹ, awọn idoko-owo si awọn amayederun ikẹkọ ati awọn nǹkan elo ati awọn ounjẹ ile-iwe lati eto ounjẹ agbaye ṣe iranlọwọ lati mu iforukọsilẹ soke nipasẹ ni ẹgbẹ- miliọnu.. 