- Thinking and Problem Solving (Open Learning Units for Psychology in School and Colleges: Cognitive) by Philip Banyard, Nicky Hayes, 01 September, 1991
- Open Problems in Mathematical Systems and Control Theory (Communications and Control Engineering) by Vincent D. Blondel, Eduardo D. Sontag, et all October, 1999
- Current Issues in Open Economy Macroeconomics: Paradoxes, Policies, and Problems by J.L. Ford, June, 1990
- Thinking and Problem Solving: Pack of Five (Open Learning Units for Psychology in School and Colleges: Cognitive) by Philip Banyard, Nicky Hayes, 01 September, 1991
- Information Theory: New Trends and Open Problems by G. Longo, January, 1975
- Positivity in Lie Theory: Open Problems (De Gruyter Exposition in Mathematics , Vol 26) by Joachim Hilgert, Jimmie D. Lawson, et all August, 1998
- DCE 1.2.2 Problem Determination Guide - Volume 1 by The OpenGroup,
- Open learning : systems and problems in post-secondary education by Norman Ian MacKenzie,
- Erfahrung und schulisches Lernen : zum Problem der Ãffnung von Schule und Unterricht
- Adjustment problems in advanced open economies : Japan and Germany
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