:Thanks for noting this .  I've made an attempt to improve that section to meet the facts and to provide references. Unfortunately, some material is unsupported because no studies have been attempted of "foundational language" usage in primary schools in the Philippines.  It is too large a topic for doctoral research in the Philippines, and is not on the agenda for DepEd or CHED. Except for the Lubuagan pilot project, local languages are not used in elementary or secondary schools, mainly because teachers come from outside the local language area but usually from within the regional language area, so they use the regional language as the foundational language.