The article is organised around three themes, each one illuminating half a century of historical life: (i) the first theme relates to the second half of the nineteenth century, analysing the role of statistics in the formation of state education systems; (ii) the second theme concentrates on the first half of the twentieth century and the importance of tests, examinations and surveys in the development of ` pedagogical modernity'; (iii) the third theme looks at the historical period of the second half of the twentieth century, and how databases began to be used as an important tool in the formulation of educational policies. To conclude, the article underlines how comparison is becoming one of the main instruments of governance in contemporary societies - in other words, how power tends increasingly to be exercised through policies that claim to be 'obvious', 'natural', 'evidencebased', instead of being grounded on ideological and political options. Gross National Product counts air pollution and cigarette advertising, and ambulances to clear our highways of carnage. It counts special locks for our doors and the jails for the people who break them. It counts the destruction of the redwood and the loss of our natural wonder in chaotic sprawl. It counts napalm and counts nuclear warheads and armored cars for the police to fight the riots in our cities. It counts Whitman's rifle and Speck's knife, and the television programs which glorify violence in order to sell toys to our children. Yet the gross national product does not allow for the health of our children, the quality of their education or the joy of their play. It does not include the beauty of our poetry or the strength of our marriages, the intelligence of our public debate or the integrity of our public officials. It measures neither our wit nor our courage, neither our wisdom nor our learning, neither our compassion nor our devotion to our country, it measures everything in short, except that which makes life worthwhile. (Robert Kennedy, 1968)
