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# Multilingual Demographic Dictionary, second unified edition, English volume

# Change of track

**Change of track {{{CompleteIndexTerm}}}**

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Other statistics concern educational progression. An individual progresses normally grade by grade, from the lowest class of elementary school, to the end of his studies. **Leaving school** ^{1}, where compulsory education is enforced, is exceptional during school age, barring illness or death. The **dropout rate** ^{2} is the probability of leaving school before obtaining a degree, either during the year or at the end of a grade, and it is constructed in the same way as a probability of dying in a life table; its complement to one is the **retention rate** ^{3}. Such rates can be used to compute a **table of school life** ^{4}, from which it is possible to infer the **mean length of schooling** ^{5}. At the end of the school year, pupils or students who do not terminate their studies, may either repeat the grade or move on to the next grade, with or without **change of track**^{6}. According to the fate of these pupils or students at the end of the academic year, **proportion repeating a school year** ^{7★} are established.
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