Professor A. K. Nigam received a PhD from Banaras Hindu University, India, and has taught at the Indian Agricultural Statistics Research Institute and Lucknow and Banaras Hindu Universities, India. He has over 50 years of wide-ranging experience, and has over 100 publications to his credit, including three books, one hand-book and four research monographs. He is currently Consultant Advisor to the Institute of Applied Statistics and Development Studies, India.Dr Ravindra Srivastava received a PhD from the Institute of Social Sciences of Agra University, India. He has worked as Research Scientist at the Indian Agricultural Statistics Research Institute and the Indian Institute of Sugarcane Research. He is the author of more than 20 journal articles, and works at the Institute of Applied Statistics and Development Studies, India.Dr A. C. Kulshreshtha is the former Additional Director General of the Central Statistical Organisation, India, and served the Indian Statistical Service for thirty-two years. He also worked at the United Nations Statistical Institute for Asia and the Pacific, and has published more than 100 research papers.Dr Kuldeep Kumar received his PhD from the University of Kent, UK, and taught at the Indian Institute of Management, Lucknow, and the National University of Singapore before joining Bond University, Australia, in 1993. He is a Fellow of the Royal Statistical Society and a chartered statistician, and has published more than 125 research papers.