What does Affidavit of Examination-in-chief mean?

After issues are finalised the trial starts with filing of affidavit of examination in chief usually by the plaintiff and every witness either on plaintiff's side or defendant's side state through this chief affidavit what they have to say in relation to the case as witnesses - And after filing of chief affidavits the cross examination of witness will take place.  The admission of documents will usually take place along with the filing of the chief affidavit. 

Thanks. So admission & denial of documents takes place after filing of this affidavit?

Yes, but before marking of documents as Exhibits. Once the documents are marked, then denial of the same is impossible. It can be rebutted through oral evidences only during Cross examination.

I agree with Mr.Gundlapallis and Mr.Gurunarayan Rao

can we file extra documets after affdavit of examination in chief.....??...how can we add  parties to a suit after affidavit stage??