1 Berkeley Yacc owes much to the unflagging efforts of Keith Bostic. 2His badgering kept me working on it long after I was ready to quit. 3 4 Berkeley Yacc is based on the excellent algorithm for computing LALR(1) 5lookaheads developed by Tom Pennello and Frank DeRemer. The algorithm is 6described in their almost impenetrable article in TOPLAS 4,4. 7 8 Finally, much of the credit for the latest version must go to those 9who pointed out deficiencies of my earlier releases. Among the most 10prolific contributors were 11 12 Benson I. Margulies 13 Dave Gentzel 14 Antoine Verheijen 15 Peter S. Housel 16 Dale Smith 17 Ozan Yigit 18 John Campbell 19 Bill Sommerfeld 20 Paul Hilfinger 21 Gary Bridgewater 22 Dave Bakken 23 Dan Lanciani 24 Richard Sargent 25 Parag Patel 26