The two central classifications in this area of study are the point and method of articulation.  
The two central classifications in this area of study are the point and method of articulation.  Combinations of these two parts give the full description of the sound made during, for example, a glottal stop or a dental fricative.  FTP, name this branch of linguistics concerned with classifying the sounds which comprise language.
The two central classifications in this area of study are the point and method of articulation.  
phonetics