ɪɾ ɐlˈaʊz fɔːɹ ɡˈoʊ, nˈoʊɡˌoʊ dᵻsˈɪʒənz æɾ ˈiːtʃ stˈeɪdʒ tə tˈeɪk ɐdvˈæntɪdʒ ʌv nˈuː nˈɑːlɪdʒ ɔːɹ tʃˈeɪndʒɪŋ səsˈaɪəɾəl pɹaɪˈɔːɹᵻɾiz.
It allows for go, no-go decisions at each stage to take advantage of new knowledge or changing societal priorities.