Articles
Editor's Introduction
Iris van Rooij
Indentations and Starting Points in Traveling Sales Tour Problems: Implications for Theory
James N. MacGregor
Relevancy in Problem Solving: A Computational Framework
Johan Kwisthout
Human Performance on Hard Non-Euclidean Graph Problems: Vertex Cover
Sarah Carruthers, Michael E. J. Masson, and Ulrike Stege
Insight Problem Solving: A Critical Examination of the Possibility of Formal Theory
William H. Batchelder and Gregory E. Alexander