To ask the Scottish Executive whether the Scottish Qualifications Authority sets the pass and grade boundary marks for the Higher Still exams for which it is responsible by (a) mapping the distribution of marks actually gained (i) against a normal distribution curve with a single peak, (ii) against a normal distribution curve with two peaks with different "Y" values or (iii) using a different mathematical algorithm and, if so, what the details are, (b) setting and fixing, within a small adjustment range, the expected standard of answer that will earn the necessary marks prior to marking or (c) any other method.