This D.Sc. presents a selected series of publications, focusing on the understanding and diagnosis of male infertility. Twenty five articles are presented from work spanning 1990-2018. Experiments assessing the predictive/diagnostic potential of a basic semen analysis and kinematic parameters of sperm motility in the context on in vivo conception are described as are studies aimed at improving the understanding of sperm function. This knowledge has been used to potentially develop new diagnostic tests for use at home and in the laboratory. A consistent theme has been involvement with national and international authorities to use evidence based information for making recommendations for both the diagnosis and treatment of the sub fertile male
