[How to develop Choosing Wisely recommendations for internal medicine].

"Choosing Wisely" is an initiative of the German Society of Internal Medicine with the aim to provide recommendations for diagnostic and therapeutic procedures that are of clear medical and scientifically proven benefit, but are rather underused in daily practice. As such, these positive recommendations are indicative of an undersupply. On the other hand, the German Society of Internal Medicine also developed "negative recommendations", pointing out diagnostic and therapeutic procedures that are frequently used but for which there is little or no scientific evidence. They indicate oversupply. So far, the various internal medicine societies have each developed five positive and five negative recommendations, and there are more to come.