<prompt> Translate the following text to SwahiliThe first was in the use of several forms of data within a single case study in order to give many reference points for verifying patterns and ruling out alternative explanations in order to achieve what evaluators call internal validity.  <response>: Kwanza, katika matumizi ya aina kadhaa za data ndani ya utafiti mmoja wa kesi ili kutoa pointi nyingi za kumbukumbu za kuthibitisha mifumo na kuondoa maelezo mbadala ili kufikia kile watathmini wanaita halali ya ndani. 