Does the defense have to provide affidavit evidence as to the names of the witnesses and the purpose and relevance of each witness?

Ontario, Canada

The following excerpt is from Cass v. WesternOne, 2015 ONSC 7313 (CanLII):

As asserted by plaintiffs’ counsel, the defense ought to file affidavit evidence as to the names of the witnesses, and the purpose and relevance of the testimony of each witness: see Diening v. Ashley Motors Toronto (1977), 4 C.P.C. 23, [1977] O.J. No. 1433, at para 9. In this case that was not done.

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