“The Dictionary meaning of the expression "due diligence" as given in the Blacks Law Dictionary, Sixth Edition, 1990 means "Such a measure of prudence, activity or assiduity, as is properly to be expected from, and ordinarily exercised by, a reasonable and prudent man under the particular circumstances; not measured by any absolute standard, but depending on the relative facts of the special case." Similarly the Law Lexicon by P. Ramanatha Aiyer, Second Edition (Reprint) 2001 explains "due diligence" to mean such watchful caution and foresight as the circumstances of the particular case demands. While examining the explanation offered or cause shown as to why in spite of due diligence a party could not have raised the matter before commencement of trial, the Court may have to see the circumstances in which the party is seeking amendment. In short the explanation as to "due diligence" depends upon the particular circumstances and the relative facts of each case to reach a conclusion one way or the other.”