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Open Access. Start display at page:. Validity can be sub-categorised as external and internal validity External validity Burns and Grove describe external validity as the extent to which the results can be generalised beyond the sample used in the study. All Rights Reserved. The researcher deemed this approach to be suitable for gaining a better understanding of why adolescent mothers in the Piet Retief Mkhondo area failed to utilise contraceptives effectively to prevent unplanned pregnancies.
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