1. A multiple group method of factoring the correlation matrix

   • L. L. Thurstone

   OriginalPaper Pages: 73 - 78

2. The relation of item difficulty and inter-item correlation to test variance and reliability

   • Harold Gulliksen

   OriginalPaper Pages: 79 - 91

3. Factor analysis calculations by tabulating machines

   • D. M. Hall
   • E. L. Welker
   • Isabelle Crawford

   OriginalPaper Pages: 93 - 125

4. A note on reliability

   • Hyman B. Kaitz

   OriginalPaper Pages: 127 - 131

5. Factorial design and covariance in the study of individual educational development

   • Palmer O. Johnson
   • Fei Tsao

   OriginalPaper Pages: 133 - 162

6. The reliability of component scores

   • Frederick B. Davis

   Erratum Pages: 163 - 163