This book offers demographic analysis, client appraisal, trial design, etc along with many examples to inform the conception and critical evaluation of consumer health informatics services. Patient safety, legal and ethical appraisal, and business models add to the systematic coverage. Regarding longevity and increase of chronic diseases traditional medical care faces tremendous financial and human resource problems. Is self-service medicine as follow up of traditional care or as an approach in its own right the answer? Are internet and app stores the place where self service medicine takes place? The book distinguishes stages of such an endeavour.