Because experimentation is iterative, the results of one experiment alter plans for following experiments.
bɪkˈʌz ɛkspˌɛɹɪməntˈeɪʃən ɪz ˈɪɾɚɹətˌɪv, ðə ɹɪzˈʌlts ʌv wˈʌn ɛkspˈɛɹɪmənt ˈɔltɚ plˈænz fɔːɹ fˈɑːloʊɪŋ ɛkspˈɛɹɪmənts.