Heller, Robert. "Hard Core Reform". Management Today. November 1990, 42.
2.
Underwood, Peter G.Managing Change in Libraries and Information Services: A Systems Approach . London: Clive Bingley, 1990, p. 23.
3.
Jantsch, Erich. "Forecasting and Systems Approach: A Frame of Reference". Management Science19(12): 1355-1367 (1973).
4.
Earl, Michael J. "IT and Strategic Advantage: A Framework of Frameworks". In: Information Management: The Strategic Dimension. London: Oxford University Press, 1988.
5.
An excellent starting point for the study of "soft" methods is Systems Thinking, Systems Practice by Peter Checkland. Wiley, 1981.
6.
Checkland, Peter and Jim Scholes.Soft Systems Methodology in Action, Wiley, 1990.
7.
Checkland, Peter.Systems Thinking, Systems practice. Wiley, 1981.
8.
Checkland, Peter. "Techniques in Soft Systems Practice Part 2: Building Conceptual Models" Journal of Applied Systems Analysis6:41-49 (1979).
9.
An interesting exception is offered by Peter Checkland in "Achieving 'Desirable and Feasible' Change". Journal of the Operational Research Society36(9): 821-831 (1985).
10.
An extended study and critique of the approach can be found in Soft Systems Methodology in Action by Peter Checkland and Jim Scholes. Wiley, 1990, pp. 59-87 and 277-302.