Abstract : This program was designed to allow interaction between MURI investigators and Southwest Research Institute and to allow SwRI to perform independent research on high cycle fatigue mechanisms. The program goals were met. Two students performed experiments with the SwRI micromechanics facilities. Four manuscripts for publication are included in this report from the independent research effort. The results show (1) that fretting fatigue in the blade-disk attachment is a very difficult damage mechanism to understand and predict (2) the HCF/LCF interaction has a small effect on fatigue crack growth, and (3) there is still much to be learned about how microstructural variations affect fatigue crack growth mechanisms through Ti- 6Al-4V. However, considerable progress was made in this program towards understanding the disk-blade attachment problem