Samir R. Nath is a Senior Staff Statistician at the Research and Evaluation Division of BRAC. He has studied Educational Research Methodology at Oxford and has been associated with the education research of BRAC since 1991. He spent time at the National Foundation for Educational Research (NFER), UK as a visiting researcher. Mr. Nath has published in reputed journals at home and abroad on basic education, health knowledge, education and child labour, and arithmetic knowledge of children at the primary level. He was also associated with the development of the ABC. A Mushtaque R Chowdhury is the Deputy Executive Director and Director of Research of BRAC. He obtained a Ph.D. from London and contributed many articles and books in the areas of public health, education and poverty eradication. He is the co-ordinator of the Working Group of Education Watch.