Mental health informatics is a branch of health or clinical informatics focused on the use of information technology (IT) and information to improve mental health. Like health informatics, mental health informatics is a multidisciplinary field that promotes care delivery, research and education as well as the technology and methodologies required to implement it. Metrics and coding Terminology and coding systems such as the (DSM) Specific mental health assessment and diagnostic systems Data collection and storage systems Systematic collection of information is fundamental to successful practices. Collecting data useful for mental illness diagnosis and treatment is challenging, as we lack quantitative biomarkers that might be used in standard health informatics, such as body temperature or blood pressure. Largely, current diagnosis and treatment is driven by clinical interviews between professionals and patients. Interviews are not only difficult to draw standardized data from because of diverse individual experience, condition, and accuracy of a patient's memory. Rapid advancements in computation and storage systems have the potential to transform this data collection process. For example, a 2014 study in Ireland explored the use of a smartphone application to record daily mood and thoughts. Such a collection process would provide plentiful standardized data less afflicted by patient recollection issues. Integration of mental health function into electronic health record systems (EHRs) and larger organisational systems Mobile and digital sensors The ubiquity of smartphones and other mobile computing platforms is beginning to enable new types of data collection. Recent work has pioneered the use of passive data collection combined with analysis to provide highly relevant features such as: amount of time exposed to human speech, geospatial activity (total distance traveled throughout the day), physical activity, and sleep duration. Additionally, researchers are prototyping simple mobile applications that could replace portions of infrequent qualitative clinical interviews with more regular quantitative data. Telehealth Telehealth, telemedicine and telepsychiatry are new care delivery methods made possible by information technology. Specifically, there is a body of research investigating the use of mobile devices to deliver treatment suggestions or treatment reminders in the context of mental health. Much of the telehealth literature is concerned with patient populations that are difficult to provide traditional medical care to, such as those in rural locations, soldiers, or veterans. These groups stand to benefit from telehealth practices. An inspector general review of US Veterans Affairs facilities in North Carolina and Virginia revealed that 36% of patients had to wait