Kurt Lewin from a leader. Members are given choices and collectively decide the division of labor. Praise and criticism in such an environment are objective, fact minded and given by a group member without necessarily having participated extensively in the actual work. Laissez-faire environments give freedom to the group for policy determination without any participation from the leader. The leader remains uninvolved in work decisions unless asked, does not participate in the division of labor, and very infrequently gives praise. An early model of change developed by Lewin described change as a three-stage process. The first stage he called "unfreezing". It involved
John Hersey Black Panthers in New Haven, Connecticut, Hersey wrote "Letter to the Alumni" (1970), in which the former Yale College master sympathetically addressed civil rights and anti-war activism – and attempted to explain them to sometimes-aggravated alumni. Hersey also pursued an unusual sideline: he operated the college's small letterpress printing operation, which he sometimes used to publish broadsides – during 1969 printing an elaborate broadside of an Edmund Burke quote for Yale history professor and fellow residential college master Elting E. Morison. For 18 years Hersey also taught two writing courses, in fiction and non-fiction, to undergraduates. Hersey taught his last