H. Rittel

Dilemmas in a general theory of planning

H. Rittel, M. Webber, 1973 .

Systems Analysis of the ‘First and Second Generations’

H. Rittel, 1982 .

Second-generation design methods

H. W. Rittel, H. Rittel, 1984 .

On the Planning Crisis : Systems Analysis of the 'First an d Second Generations '

H. Rittel, H. Rittel, Professor H. Rittel, 2006 .

Methods of analysis and evaluation of information needs : a critical review

Werner Schwuchow, Werner Kunz, Horst W. J. Rittel, 1977 .