1. Editorial

   • Mike C. Jackson

   EditorialNotes Pages: 579 - 580

2. Benchmarking

   • Russell L. Ackoff

   OriginalPaper Pages: 581 - 581

3. Some difficulties of ecological thinking, considered from a critical systems perspective: A plea for critical holism

   • Werner Ulrich

   Papers Pages: 583 - 611

4. A unified systems hypothesis

   • Derek K. Hitchins

   Papers Pages: 613 - 645

5. Creative problem solving in the specification of information requirements

   • Oscar Gutierrez
   • Ellen Greenberg

   Papers Pages: 647 - 667

6. Variety in systems thinking

   • Gerald Midgley

   Book Review Editorial Pages: 669 - 669

7. Book reviews

   • Fenton F. Robb
   • Eric Schwarz
   • Steven Isbell

   BookReview Pages: 671 - 697

8. News

   News Pages: 699 - 700