He added theoretical contributions to the German and Middle High German language.[3] He formulated Behaghel's laws that describe the principles that govern word positions in a sentence. His work is still important in Theme and rheme research.
^Roedder, Edwin (1936). "Otto Behaghel 3. Mai 1854 - 9. Oktober 1936 Ein Gedenkblatt". Monatshefte für Deutschen Unterricht. 28 (8): 364–366 – via JSTOR.
^Gustafsson, Marita (1974). "THE PHONETIC LENGTH OF THE MEMBERS IN PRESENT-DAY ENGLISH BINOMIALS". Neuphilologische Mitteilungen. 75 (4): 663–677 – via JSTOR.