Limitations in solid-state technology

In a field in which success is a matter of record some constructive criticism is in order to spur even greater and more meaningful progress. In this vein the present article highlights shortcomings and limitations in the burgeoning area of solid-state technology. One of the main problems is that practice so often outdistances fundamental theory and understanding. Thus it is important that we be able to predict the growth and changes in the technology, but unfortunately our techniques of analysis, simulation, and measurement are inadequate and the number of theoretical limits pitifully small. Undoubtedly, more effort is essential.