Abstract: Concerted breeding efforts on mungbean improvement at NIAB Faisalabad, Pakistan has resulted in the development of a diverse, high yielding, and disease resistant elite line; NM 89, derived from hybridization between a small seeded variety; NM 20-21 and an exotic large seeded AVRDC accession VC 1482E, after vigorous sifting in different segregating generations. True breeding plant progenies were bulked and were evaluated for yield potential in various yield trials laidout at NIAB, Faisalabad from 1990-95. NM 89 produced seed yield of 1971 kg ha -1 on an overall basis which was 42.77 and 21.77 per cent higher as compared to check varieties NM 20-21 and NM 51 respectively. Based on 1996 and 1997 mean yield performance in adaptation yield trials, NM 89 produced seed yield of 1213 kg ha -1 which was 17 per cent higher as compared to standard check NM 51. Among yield components, NM 89 had the highest number of pods per plant. It had shown resistance against Cercospora leaf spot (CLS) and mungbean yellow mosaic virus (MYMV). Based on desirable morphological characteristics and superb seed yield criteria, NM 89 was approved as NIAB MUNG 98 in November, 1998 by the Punjab Seed Council for general cultivation in the Province.