A common language is necessary for a unified national community  The moment when the governments starts subsidizing mother tongue education for large immigrant groups is the moment when they will lose any incentive to learn the local language. Because most of these children do not interact with the local language until the age they should go to school, under the proposition plan they will not interact with it at all and therefore creating a major gap between native population and immigrants. A common language represents a unifying framework under which a state can function properly by promoting mutual help and understanding inside the population. [1] When people talk different languages, there is no unifying framework and the state as a whole loses its ability to promote unity within its borders. This is the case of Papua New Guinea where there is no central authority. The tribes live separately and are not able to one with another because there are over 800 different languages spoken at this moment in the country. [2] As a result during the post-colonization era efforts were made to create and promote a common language to help trade and understanding between tribes. The language that was called Tok Plsin is now the most widely spoken language in the country and one of the three official languages. [3] Because mutual-help and overall social stability can be achieved only with a strong communication between different parties, promoting mother tongue language for immigrants will only slow the road towards progress.  [1] Center for Child Well Being, ‘The Importance of Language’, education.com, 15 July 2013,   [2] ‘Papua New Guinea’s tribes and traditions’, The Telegraph,   [3] Siegel, Jeff, ‘Tok Pisin’, Hawaii.edu,