The purpose of the Pacific Northwest Tree Improvement Research Cooperative (PNWTIRC) is to conduct genetics and breeding research on Pacific Northwest tree species with the goal of providing priority information that will enhance the efficiency of tree improvement efforts. Emphasis is on region-wide problems dealing with major coniferous species. The PNWTIRC is concerned with both tree breeding and mass production of genetically improved materials. Another important objective of the Cooperative is to foster communication among tree improvement workers throughout the Pacific Northwest.