According to height:
high (close) vowels articulated with the tongue located as high as possible in the oral cavity, thus narrowing the passage for the airflow: /ɪ/, /iː/, /ʊ/, /uː/
mid (mid-open) vowels with the tongue lowered to the mid position in the oral cavity: /æ/, /ɒ/, /ʌ/, /ɑː/
low (open) vowels produced with the tongue positioned as low as possible in order to leave a lot of space for the airflow: /e/, /ɔː/, /ɜː/, /ə/
front vowels articulated with the tongue far forward in the oral cavity toward
the hard palate: /iː/, /ɪ/, /e/, /æ/
According to advancement:
front vowels articulated with the tongue far forward in the oral cavity toward the hard palate: /iː/, /ɪ/, /e/, /æ/
central (mixed) vowels produced with the tongue retracted to the middle position in the oral cavity: /ʌ/, /ɜː/, /ə/
back vowels produced with the tongue retracted as far as possible to shape the space in the front part of the oral cavity: /ɒ/, /ɔː/, /ʊ, /uː/, /ɑː/