Concepts: a tutorial / Edouard Machery -- Fuzzy logic: a tutorial / Radim Belohlavek, George J. Klir -- "Slow lettuce": categories, concepts, fuzzy sets, and logical deduction / Eleanor H. Rosch -- Fallacious perceptions of fuzzy logic in the psychology of concepts / Radim Belohlavek, George J. Klir -- Representing concepts by fuzzy sets / Jay Verkuilen, Rogier A. Kievit, Annemarie Zand Scholten -- Formal concept analysis: classical and fuzzy / Radim Belohlavek -- Conceptual combinations and fuzzy logic / James A. Hampton -- Concepts and natural language / James A. Hampton