The following discussion between the two authors follows a ‘Colloquium’, published in the December 1993 issue of Futures, which explored Harman's views on science and business. The Colloquium consisted of an article by Harman and six responses. The responses were broadly sympathetic to Harman's position; one, by Yehezkel Dror, was sharply critical. There was no further response from Harman. In ... [Show full abstract] Williams's view, the clarity of Harman's message is reduced by some avoidable weakness in argument, and the feasibility and relevance of one of Harman's main prescriptions is suspect. Early in 1995, Williams wrote to Harman to invite discussion. The following is an edited version of the correspondence, together with some further comments.