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Yet the extent to which technology has transformed 
education needs to be debated. Change resulting from the use of digital technology is incremental, uneven and bigger  in some contexts than others. The application of digital technology varies by community and socioeconomic level, by teacher willingness and preparedness, by education 
level, and by country income. Except in the most 
technologically advanced countries, computers and devices are not used in classrooms on a large scale. Technology use is not universal and will not become so any time soon. 
Moreover, evidence is mixed on its impact: Some types of technology seem to be effective in improving some kinds of learning. The short- and long-term costs of using digital technology appear to be significantly underestimated. 
The most disadvantaged are typically denied the 
opportunity to benefit from this technology.