To a great extent this « conventional » versus « emerging » classification is based on the WHO's Priority Assistive Products List  and the ISO 9999 standard for assistive products for persons with disabilities, the APL delineating the absolute minimum that countries should be offering to their citizens and ISO 9999 defining those products which are already well established in the market.
tʊ ɐ ɡɹˈeɪt ɛkstˈɛnt ðˈɪs « kənvˈɛnʃənəl » vˈɜːsᵻz « ɪmˈɜːdʒɪŋ » klˌæsɪfɪkˈeɪʃən ɪz bˈeɪst ɔnðə hˌuː pɹaɪˈɔːɹᵻɾi ɐsˈɪstɪv pɹˈɑːdʌkts lˈɪst ænd ðɪ ˌaɪˌɛsˈoʊ nˈaɪn θˈaʊzənd nˈaɪnhˈʌndɹɪd nˈaɪnti nˈaɪn stˈændɚd fɔːɹ ɐsˈɪstɪv pɹˈɑːdʌkts fɔːɹ pˈɜːsənz wɪð dˌɪsɐbˈɪləɾiz, ðɪ ˌeɪpˌiːˈɛl dᵻlˈɪniːˌeɪɾɪŋ ðɪ ˈæbsəlˌuːt mˈɪnɪməm ðæt kˈʌntɹiz ʃˌʊd biː ˈɔfɚɹɪŋ tə ðɛɹ sˈɪɾɪzənz ænd ˌaɪˌɛsˈoʊ nˈaɪn θˈaʊzənd nˈaɪnhˈʌndɹɪd nˈaɪnti nˈaɪn dᵻfˈaɪnɪŋ ðoʊz pɹˈɑːdʌkts wˌɪtʃ ɑːɹ ɔːlɹˌɛdi wˈɛl ɪstˈæblɪʃt ɪnðə mˈɑːɹkɪt.