Furthermore, this has implications for estimation of the returns to education that rely upon RoSLA reforms as an instrumental variable.
Hence, any RoSLA policy effect could include an adjustment effect as a result of curriculum change.
It does not appear, however, that high school class sizes increased at the time of RoSLA in Spain.
Figure 1 reports minutes of sickness absence before and after RoSLA for three groups, high school teachers, primary school teachers, and all other workers.
And the interaction term [RoSLA.sub.it] x [HST.sub.i] equals 1 for treated individuals (HSTeachers) in the post-treatment period (after the RoSLA was implemented).
Table 2 presents estimates of the effect of RoSLA on high school teacher absence behavior.
An additional issue is that we do not possess a nonpolicy control group (i.e., schools or regions where there is no RoSLA).
In addition, no policy effect was evident when we investigated a placebo reform for the year prior to the actual RoSLA.
The preparations for ROSLA were delayed in 1968, and the decision was reached in 1971 that the new upper age limit would be enforced from September 1, 1972 onwards.
The two new 'ROSLA' posts were taken by the head of woodwork and metalwork and the head of home economics.
So to address the requirements of ROSLA, the answer was simply to increase the amount of time given over to 'practical subjects'.
Thus the 'ROSLA Kids' as they were known, received a timetable which was filled up with extra PE and woodwork and metalwork, for the boys and cooking and textiles for the girls As head of 5th Year I arranged an 'extended studies' programme for the ROSLA children.