Mr. C. PANNEERSELVAM Administrative Officer, Dr. M.G.R. Educational and Research Institute University, (PhaseII), Madhuravayal, Chennai - 95 Declaration I hereby declare that the thesis entitled “Developing, Validating and Measuring the Effectiveness of E-Content in the subject social science at Secondary Level” submitted by me for the Degree of Doctor of Philosophy in Education is the result of my original and independent research work carried out under the guidance of Dr. R. Krishnakumar, Professor of Education, Department of Education, Annmalai Univeristy and it has not been submitted for the award of any degree, diploma, associateship, fellowship of any University or Institution. Place: Date: (Signature of the candidate)