Defendant was convicted by a jury of the crime of taking indecent liberties with the person of a female child under the age of 16 without committing or attempting to commit the crime of rape or the crime of sodomy or gross indecency. MCLA § 750.336 (Stat Ann 1954 Kev § 28.568).

On this appeal of right, defendant assigns as error the admission of testimony by Naomi Astolfi, age nine, and that of her brother Mark, age seven, relating to the acts allegedly perpetrated upon the girl by defendant.

Pursuant to statutory authorization, ^[1] the trial judge examined the children in order to ascertain if they were intelligent enough to testify and had the sense of obligation to tell the truth. He determined that both met the requisite test. Absent some indication of palpable error in this determination,[*593] we do not disturb it. Tbe learned trial judge had the opportunity to appraise the competence of these children to testify. He examined them as the statute mandates. He found to “his own satisfaction” that they were competent. For us to substitute our judgment for his in this area reserved by statute to him would be an unwarranted interference with his proper prerogative. There was no error.

As his second ground for reversal of the verdict, defendant asserts the prejudicial waiver by trial counsel of what is characterized as certain of his constitutional rights, i.e., waiving production of two witnesses and failure to object to introduction of a statement made by defendant after his arrest. He relies on People v. Degraffenreid (1969), 19 Mich App 702.

From the time this Court enunciated the so-called “Degraffenreid rule”, it has become one of the most frequently cited and most misunderstood of our decisions. Degraffenreid should not be read by the bar to mean that because an objection could have been made or that some right was waived that this necessarily indicates incompetence of counsel or prejudice to the defendant. As the ones to whom the conduct of the trial and the choice of strategy have been entrusted, trial counsel may reasonably believe it advantageous, at times, to forego exercising certain rights for tactical reasons. On appeal it behooves us not to play the part of the Sunday morning quarterback ^[2] and to second-guess him.

Usually omitted from appellants’ quotations of Degraffenreid is the limiting and cautionary lanquage that is often repeated in the opinion.

[*594] “Most post-conviction claims of disgruntled clients are indeed insubstantial.” Degraffenreid, supra.

We would not be understood by wbat we have said here to dilute the Degraffenreid doctrine. We mean rather that it should be carefully read before reversible error is claimed on the grounds of the incompetence of counsel. Such incompetence must be grave indeed to be raised to the constitutional level of no assistance of counsel.

Viewing the whole record here, it cannot be said that defendant did not have the effective assistance of counsel in the constitutional sense. There was sufficient, competent evidence, if believed by the jury, to find defendant guilty beyond a reasonable doubt. People v. Geddes (1942), 301 Mich 258.

Affirmed.