Lewis naTolman (1909) vakatsanangura kuwirirana kwekupararira kwenguva vachishandisa maawa maviri echiedza A naB, vachifamba nekumhanya kwakati kune mumwe nemumwe. Mawachi acho ane zvioni zviviri zvakaenzana kune mumwe nemumwe uye kune mutsara wekufamba. Pakati pezvioni chiratidzo chechiedza chiri kudzoka, uye kune mucherechedzi akazorora mune imwe nhungamiro seA, nguva yeawa yeA ndiyo nzvimbo iri pakati pezvioni yakakamurwa nekukurumidza kwechiedza. Asi kana mucherechedzi achiona pawachi B, anoona kuti wachi inoitika mukati mechiratidzo chewachi, anotevera chiratidzo chakabuda, B uye B. Lewis naTolman (1909) vakatsanangura kuwirirana kwekupararira kwenguva vachishandisa maawachi maviri echiedza A naB, vachifamba nekumhanya kwakati kune mumwe nemumwe.
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