THE AUTHORS ARE DEEPLY grateful to Dr. D.P. Pattanayak, the Director, C.I.I.L., who has been the constant source of inspiration and guidance for all the academic work in C.I.I.L.

Thanks are due to Dr. C.H.K. Misra, (then Deputy Director, C.I.I.L.) who supervised the first two studies. Grateful thanks are due to Dr. E. Annamalai, Deputy Director, C.I.I.L., who provided expert guidance at every step in finalizing the first report, and without whose sincere help it would not have been possible to complete this report in this form.

Also thanks are due to Mrs. J. Sakuntala Sharma, Research Officer, C.I.I.L., who extended her help at all stages of the first two studies by giving her valuable suggestions.

The authors will be failing in duty if they do not express their heart-felt gratitude to the various Headmasters/Headmistresses and students for their cooperation in supplying the required information in a short time.

We are thankful to Shri N.H. Itagi, Assistant Cartographer, C.I.I.L. for preparing the drawings of the graphs and finally our thanks are also due to Shri H.L.N. Bharati, Publications-in-Charge, C.I.I.L., for his immense care and help in bringing out this publication in an attractive form. The other staff of the Institute who helped in the third study are mentioned at the end of the third report.

- Authors