<prompt> Translate the following text to EnglishHata hivyo, hata katika majaribio ya randomized ya kati ya maingiliano ambayo hutumia mahojiano ya kuhamasisha, hatuwezi kutathmini athari za viwango vya ujuzi wa washauri.  <response>: In any case, he observed, even in the existing randomized trials of interventions that use motivational interviewing, we cannot evaluate the effect of counselors skill levels. 