Generally, however, open and distance education was not seen as a suitable vehicle for primary education. In contrast, at the secondary level, "open and distance learning has solid records of achievement, and grand claims of potential". Particularly at the secondary level, open schools have added greatly to the number of educated school leavers. However, the proportion of those who enter and drop out before they graduate can be high: the "open door" can all too easily become a "revolving door" – particularly where students are unsupported in their studies.
Comparisons in terms of quality are acknowledged to be difficult, not least because so many open and distance learning projects cater to audiences not normally reached by conventional schools – students on the margin, students in work and adults. Many of these students start with more handicaps than do conventional students.
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