that textbooks are written using only this language's script. This, in turn, would support the elevation of the language's status or could increase its prestige. In this way, acquisition planning is often used to promote language revitalization, which can change a language's status or reverse a language shift, or to promote linguistic purism. In a case where a government revises a corpus, new dictionaries and educational materials will need to be revised in schools in order to maintain effective language acquisition. The education sector The education ministry or education sector of government is typically in charge of making national language acquisition choices based on state and local evaluation reports. The duties of education sectors vary by country; Robert B. Kaplan and Richard B. Baldauf describe the sectors' six principal goals: To choose the languages which should be taught within the curriculum. To determine the amount and quality of teacher training. To involve local communities. To determine what materials will be used and how they will be incorporated into syllabi. To establish a local and state assessment system to monitor progress. To determine financial costs. Problems Although acquisition planning can be useful to governments, there are problems which must be considered. Even with a solid evaluation and assessment system, the effects of planning methods can never be certain; governments must consider the effects on other aspects of state planning, such as economic and political planning. Some proposed acquisition changes could also be too drastic or instituted too suddenly without proper planning and organization. Acquisition planning can also be financially draining, so adequate planning and awareness of financial resources is essential. Therefore, it is important that government goals be organized and planned carefully. Multilingualism There is also growing concern over the treatment of multilingualism in education, especially in many countries which were once colonized. Choosing the language of instruction which would be most beneficial to effective communication on the local and state level requires thoughtful planning, and it is surrounded by debate. Some states prefer to teach only in the official language, but some aim to foster linguistic and thus social diversity by encouraging teaching in several (native) languages. The use of a single language of instruction supports national unity and homogeneity whereas the incorporation of different languages may help students to learn better by offering alternative perspectives. Non-governmental organizations In addition to the education sector, there are non-governmental sectors or organizations