 It has also been suggested that the incorporation of GCSE awards into school league tables, and the setting of School level targets, at above national average levels of attainment, may be a driver of GCSE grade inflation.At the time of introduction the E grade was intended to equivalent to the CSE grade 4, and so obtainable by a candidate of average/median ability; Sir Keith Joseph set Schools a target to have 90% of their pupil obtain a minimum of a grade F (which was the 'average' grade achieved in 1988), the target was achieved nationally in summer of 2005.David Blunkett went further and set schools the goal of ensuring 50% of 16-year olds gained 5 GCSEs or equivalent at grade C and above, requiring schools to device a means for 50% of their pupils to achieve the grades previously only obtained by the top 30%, this was achieved by the summer of 2004 with the help of equivalent and largely vocational qualifications.