The 19 surveys and research papers collected in this study were presented at the 25th Annual Iranian Conference in Tehran. Keynote papers by Richard Guy and Andreas Dress on combinatorics, combinatorial games, molecular biology and tilings are complemented by invited survey papers on combinatorial design theory and graph theory. Contributed papers covering graphs, designs, and related combinatorics are also included. The problem session at the conference posed interesting open questions, and these are included in the book.