▁model , ▁also ▁known ▁as ▁nested ▁rel ational ▁model , ▁and ▁designed ▁a ▁graph ical ▁editor ▁which ▁also ▁served ▁as ▁base ▁for ▁ ▁research ▁on ▁synchron ous ▁group ware . ▁In ▁ 1 9 8 6 ▁he ▁author ed ▁an ▁E - learning ▁course ▁" Introduction ▁to ▁Unix ", ▁which ▁ ▁originally ▁was ▁a ▁contribution ▁to ▁Hermann ▁Ma urer ' s ▁C OST OC - Project , ▁and ▁with ▁ ▁several ▁port ings ▁was ▁in ▁active ▁use ▁until ▁ 2 0 1 5 , ▁thus ▁const itut ing ▁one ▁of ▁the ▁longest ▁running ▁examples ▁▁ ▁of ▁course ware . ▁ ▁Besides ▁his ▁scientific ▁achiev ements ▁Weg ner ▁was ▁instrument al ▁in ▁introdu cing ▁computer ▁science ▁studies ▁ ▁( B ach elor ▁and ▁Master ) ▁at ▁the ▁University ▁of ▁K ass el ▁which ▁started ▁in ▁ 2 0 0 1 ▁after ▁se cur ing ▁three ▁additional , ▁ ▁spons ored ▁professor ships ▁with ▁Tra ud l ▁Herr hausen , ▁then ▁a ▁member ▁of ▁the ▁H ess ian ▁Parliament , ▁opening ▁doors ▁to ▁ ▁industry ▁and ▁char ities . ▁ ▁Notable ▁publications ▁ ▁L utz ▁M . ▁Weg ner : ▁On ▁Par sing ▁Two - level ▁Gr amm ars ▁Act a ▁In format ica ▁ 1 4 ▁( 1 9 8 0 ) ▁pp .   1 7 5 – 1 9 3 ▁▁ ▁L utz ▁M . ▁Weg ner : ▁Quick sort ▁for ▁Equ al ▁Ke ys . ▁IE EE ▁Trans . ▁Comput . ▁ 3 4 : 4 ▁( 1 9 8 5