During the past five decades, the use of X-ray analytical methods has increased in the areas of materials characterization and phase identification. The wide range of applicability of the X-ray fluorescence method has made it a technique employed in thousands of laboratories all over the world. Over the years, many techniques and procedures have been developed that greatly enhance the versatility of the method. The purpose of the X-ray clinic is to combine theoretical and practical application of X-ray fluorescence spectrometry.