Power under Section 319 Cr.P.C. can be exercised by the trial court at any stage during the trial, i.e., before the conclusion of trial, to summon any person as an accused and face the trial in the ongoing case, once the trial court finds that there is some 'evidence' against such a person on the basis of which evidence it can be gathered that he appears to be guilty of offence. The 'evidence' herein means the material that is brought before the Court during trial. Insofar as the material/evidence collected by the IO at the stage of inquiry is concerned, it can be utilised for corroboration and to support the evidence recorded by the Court to invoke the power under Section 319 Cr.P.C. No doubt, such evidence that has surfaced in examination-in-chief, without cross-examination of witnesses, can also be taken into consideration. However, since it is a discretionary power given to the Court under Section 319 Cr.P.C. and is also an extraordinary one, same has to be exercised sparingly and only in those cases where the circumstances of the case so warrants. The degree of satisfaction required is to be more than the degree which is warranted at the time of framing of the charges against others in respect of whom chargesheet was filed and only where strong and cogent evidence occurs against a person from the evidence led before the Court that such power should be exercised. It is not to be exercised in a casual or a cavalier manner. The prima facie opinion which is to be formed requires stronger evidence than mere probability of his complicity.