The right to compensation for 1984 is initially the subject of a provisional assessment on the basis of estimates made by the prefect, after consulting the competent authorities for the organisation of school transport, taking into account, as the case may be, the results of the 1982-1983 school year or the information already available concerning the 1983-1984 school year. An adjustment is made as soon as the data for the 1983-1984 school year is known.