1. Guest editorial

   • David C. Torney

   EditorialNotes Pages: iii - iii

2. Patching upX-trees

   • Sebastian Böcker
   • Andreas W. M. Dress
   • Mike A. Steel

   OriginalPaper Pages: 1 - 12

3. Probability set functions

   • William J. Bruno
   • Gian-Carlo Rota
   • David C. Torney

   OriginalPaper Pages: 13 - 25

4. Pooling, lattice square, and union jack designs

   • Mark A. Chateauneuf
   • Charles J. Colbourn
   • David C. Torney

   OriginalPaper Pages: 27 - 35

5. Group testing for consecutive positives

   • Charles J. Colbourn

   OriginalPaper Pages: 37 - 41

6. Weakly union-free maximum packings

   • Charles J. Colbourn

   OriginalPaper Pages: 43 - 52

7. Some generalizations of Property B and the splitting property

   • Péter L. Erdős

   OriginalPaper Pages: 53 - 59

8. Probabilistic nonadaptive group testing in the presence of errors and DNA library screening

   • Anthony J. Macula

   OriginalPaper Pages: 61 - 69

9. Construction of nested balanced block designs, rectangular designs andq-ary codes

   • K. Sinha
   • R. K. Mitra

   OriginalPaper Pages: 71 - 80

10. The combinatorics and extreme value statistics of protein threading

    • John L. Spouge
    • Aron Marchler-Bauer
    • Stephen Bryant

    OriginalPaper Pages: 81 - 93

11. Sets pooling designs

    • David C. Torney

    OriginalPaper Pages: 95 - 101

12. Inverting random functions

    • Michael A. Steel
    • László A. Székely

    OriginalPaper Pages: 103 - 113