High-Temperature Superconductivity: A Macroscopic View

Over the last 12 years, impressive progress has been made in characterizingthe high temperature superconducting phenomenon and in discovering trendsabout its occurrence. As a result, many models have been advanced to accountfor the observations. In this presentation, I would like to discuss a fewissues that may be important to the understanding of high temperaturesuperconductivity but have not yet been given the attention they deserve inthe development of theoretical models.