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 Peter S. Housel 15 Dale Smith 16 Ozan Yigit 17 John Campbell 18 Bill Sommerfeld 19 Paul Hilfinger 20 Gary Bridgewater 21 Dave Bakken 22 Dan Lanciani 23 Richard Sargent 24 Parag Patel 25