The present book iS based on the lecture notes of a graduate course DesignTheory which was given at the Center for Combinatorics of Nankai Unver—sity in spring of 2001．The lecture notes were scattered over the expertsand students，modified year by year following some of their suggestions，and finally came to the present form．
The course consists of mainly the basic classical subiects of design the-ory，namely，balanced incomplete block designs，latin squares，t-designsand partially balanced incomplete block designs，and ends with associationschemes．
The fundamental concepts of balanced incomplete block designs aregiven in Chapter 1 and various classical constructions appear in Chap—ters 2 and 3．Orthogonal latin squares are studied in Chapter 4．Theconstruction of some families of balanced incomplete block designs，likeSteiner triple systems and Kirkman triple systems，appears in Chapter 6，and as a preparation pairwise balanced designs and group divisible designsare introduced in Chapter 5．t-designs and partially balanced incompleteblock designs，as generalizations of balanced incomplete block designs，arestudied in Chapters 7，8 and Chapter 9，respectively．The author iS mostly grateful to Profcssor Rodney Roberts of FloridaState University，Professor Shenglin Zhou of South China University ofTechnology and Professor Lie Zhu of Soochow University，who read themanuscript carefully，pointed out many typos and give valuable sugges—tions．Professor Zhou also prepared the bibliography and exercises for thebook．Finally．
Preface
1.BIBDs
1.1 Definition and Fundamental Properties of BIBDs
1.2 Isomorphisms and Automorphisms
1.3 Constructions of New BIBDs from Old Ones
1.4 Exercises
2.Symmetric BIBDs
2.1 Definition and Fundamental Properties
2.2 Bruck-Ryser-Chowla Theorem
2.3 Finite Projective Planes as Symmetric BIBDs
2.4 Difference Sets and Symmetric BIBDs
2.5 Hadamard Matrices and Symmetric BIBDs
2.6 Derived and Residual BIBDs
2.7 Exercises
3.Resolvable BIBDs
3.1 Definitions and Examples
3.2 Finite Affine Planes
3.3 Properties of Resolvable BIBDs
3.4 Exercises
4.Orthogonal Latin Squares
4.1 Orthogonal Latin Squares
4.2 Mutually Orthogonal Latin Squares
4.3 Singular Direct Product of Latin Squares
4.4 Sum Composition of Latin Squares
4.5 Orthogonal Arrays
4.6 Transversal Designs
4.7 Exercises
5.Pairwise Balanced Designs；Group Divisible Designs
5.1 Pairwise Balanced Designs
5.2 Group Divisible Designs
5.3 Closedness of Some Sets of Positive Integers
5.4 Exercises
6.Construction of Some Families of BIBDs
6.1 Steiner Triple Systems
6.2 Cyclic Steiner Triple Systems
6.3 Kirkman Triple Systems
6.4 Triple Systems
6.5 Biplanes
6.6 Exercises
7.t-Designs
7.1 Definition and Fundamental Properties of t-Designs
7.2 Restriction and Extension
7.3 Extendable SBIBDs and Hadamard 3-Designs
7.4 Finite Inversive Planes
7.5 Exercises
8.Steiner Systems
8.1 Steiner Systems
8.2 Some Designs from Hadamard 2-Designs and 3-Designs
8.3 Steiner Systems S(4；11，5) and S(5；12，6)
8.4 Binary Codes
8.5 Binary Golay Codes and Steiner Systems S(4；23，7) and S(5；24,8)
8.6 Exercises
9.Association Schemes and PBIBDs
9.1 Association Schemes
9.2 PBIBDs
9.3 Association Schemes (Continued)
9.4 Exercises
References
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