Assessing Justification and Proof in Geometry Classes Taught Using Dynamic Software, Jan 1998, 76–82
Can Computers Be Used to Teach Proof?, Nov 1998, 660–63
Characterizing the Nature of Students' Understandings of Mathematical Proof, Nov 1998, 714–17
Chipping Away at Proofs: A Cooperative Approach. Oct. 1999, 565-67
Developing Mathematical Reasoning Using Attribute Games. Dec. 1999, 768-75
Euclid, Fibonacci, Sketchpad, Jan 1997, 8–12 (see also Sep 1997, 480–81, 484 and Oct 1997, 566, 568
Geometry Problems Promoting Reasoning and Understanding. Feb. 1999, 114-16
"I Would Consider the Following to Be a Proof..." Nov 1998, 652–53
Ideas for Developing Students' Reasoning: A Hungarian Perspective, Nov 1998, 677–81
Learning to Reason from Lewis Carroll, Jan 1998, 6–10, 96
The Perils of Conditional Statements and the Notion of Logical Equivalence, Oct 1997, 544–48
Proof by Contradiction and the Electoral College, Nov 1998, 655–58
Proof in Modern Geometry, Nov 1998, 718–20
Proof: The Power of Persuasion, Mar 1997, 202–5
Proofs and Their Performance as Works of Art, Nov 1998, 722–25
Prove It! Nov 1998, 726–28
Publications, 1997, 334
Publications, 1998, 187–88
Publications, Apr. 1999, 371
The Pythagorean Theorem: An Infinite Number of Proofs? Sep 1997, 438–41
Reader Reflections, 1997, 67–68 (see also Oct 1997, 571), 260 (see also Dec 1997, 766), 566–68 (see also Jan 1997, 8–12), 571
Reader Reflections, 1998, 120, 514, 648–49
Reader Reflections, Jan. 1999, 80 (see also Oct. 1999, 559, 611), 81-82, Dec. 1999, 785, 793
Reader Reflections, Sept. 2000, 525
Reasoning with Algebra, Sep 1997, 442–47
The Rules of the Game. May 1999, 424-29
Sharing Ideas about Teaching Proving, Nov 1998, 704–6
Tacoma Shuffle, Mar 1998, 212–16
Technology Tips, 736–39
Traveling toward Proof. Apr. 2000, 289–91
Types of Students' Justifications, Nov 1998, 670–75
A Unified Framework for Proof and Disproof, Nov 1998, 708–13
