Rittel, Horst W. J., Dilemmas in a General Theory of Planning , Policy Sciences, 4:2 (1973:June) p.155 Rittel, Horst W. J., Dilemmas in a General Theory of Planning , Policy Sciences, 4:2 (1973:June) p.155 Rittel, Horst W. J., Dilemmas in a General Theory of Planning , Policy Sciences, 4:2 (1973:June) p.155 Rittel, Horst W. J., Dilemmas in a General Theory of Planning , Policy Sciences, 4:2 (1973:June) p.155 Rittel, Horst W. J., Dilemmas in a General Theory of Planning , Policy Sciences, 4:2 (1973:June) p.155 Rittel, Horst W. J., Dilemmas in a General Theory of Planning , Policy Sciences, 4:2 (1973:June) p.155 Rittel, Horst W. J., Dilemmas in a General Theory of Planning , Policy Sciences, 4:2 (1973:June) p.155 Rittel, Horst W. J., Dilemmas in a General Theory of Planning , Policy Sciences, 4:2 (1973:June) p.155 Rittel, Horst W. J., Dilemmas in a General Theory of Planning , Policy Sciences, 4:2 (1973:June) p.155 Rittel, Horst W. J., Dilemmas in a General Theory of Planning , Policy Sciences, 4:2 (1973:June) p.155 Rittel, Horst W. J., Dilemmas in a General Theory of Planning , Policy Sciences, 4:2 (1973:June) p.155 Rittel, Horst W. J., Dilemmas in a General Theory of Planning , Policy Sciences, 4:2 (1973:June) p.155 Rittel, Horst W. J., Dilemmas in a General Theory of Planning , Policy Sciences, 4:2 (1973:June) p.155 Rittel, Horst W. J., Dilemmas in a General Theory of Planning , Policy Sciences, 4:2 (1973:June) p.155 Rittel, Horst W. J., Dilemmas in a General Theory of Planning , Policy Sciences, 4:2 (1973:June) p.155