wˌɛɹ ɹˌɛpɹᵻzˈɛnts ðə vˈɛktɚɹ ʌv stˈeɪt vˈɛɹɪəbəlz ʌvðə sˈɪstəm,  ðə vˈɛktɚɹ ʌv kəntɹˈoʊl ˈɪnpʊts ænd ðə vˈɛktɚɹ ʌv mˈɛʒɚd ˈaʊtpˌʊts ɐvˈeɪləbəl fɔːɹ fˈiːdbæk.
where  represents the vector of state variables of the system,  the vector of control inputs and  the vector of measured outputs available for feedback.