Books We Keep

1 Ron Allen, Ph.D., BCBA-D and Jeff Kupfer, Ph.D., BCBA-D Simmons University (Boston) and University of Colorado (Denver) A science progresses with experimentation followed by application, which occasions more experimentation. …

How Fuzzy are We?

3 How Fuzzy are We? Jeff Kupfer, Ph.D., BCBA-D and Ron Allen, Ph.D., BCBA-D University of Colorado and Simmons University While clearing my files this morning, I reread Critchfield and …