It was a great lecture which talked to all basic aspects of OOP . Especially , what you 've talked about uml diagrams gave me a great interest to study more about it.I found the books which you asked and I think that their content is much important . Thank you sir for giving such references . And the last but not the least , having lecture with you , a great figure in Software Industry , I learnt many exemplary features from you and you did the lecture so openly . Thank you sir .