Summary Fracture-height prediction and evaluation is critical in understanding the effectiveness of a fracturing treatment. Volumetrically, fracturing must adhere to mass-balance equations. Therefore, prop-pant placed in the fracture must be accounted for in the creation of fracture height, width, and length. In many cases, excessive fracture height generation is at the expense of fracture-width and -length creation. As a result, in fracture treatments where excessive height growth is believed to have occurred, premature screenouts are usually the result of insufficient fracture width. This unfortunate circumstance creates an operational strain and productivity underperformance for wells. Various methods have been used to evaluate fracture height before the fracture treatment. These methods can be as simple as height estimates based on sensitivity studies of fracture-height growth for different fluids, pumping rates, and other factors, using a derived rock-stress profile within a fracturing simulator, and as complex as the most robust methods of direct measurement, using passive seismic monitoring of fracture events during an injection test. As the industry comes closer to what is believed to be direct measurement of fracture height, the level of trust increases as well. Both temperature logs and radioactive tracers have been used on a regular basis by the fracturing industry to evaluate fracture-height containment (or the lack thereof). However, the information from these tools may be quite misleading when planning a fracture treatment because of the inherent assumption made when analyzing the log data. The major assumption is of a vertical fracture propagating from the wellbore. Nevertheless, in a tectonically stressed environment, where the maximum principal stress is not always an overburden, the assumption of a vertical fracture may be incorrect. Where this is true, the indication of height control seen in these log types may be a mirage. This paper describes, through case studies, the unique problems of evaluating fracture height in tectonically stressed formations. Furthermore, it shows that while both temperature and tracer logs may add value to evaluating fracture effectiveness, their results should be validated by a thorough pressure analysis of the injection data. If this critical step is forgone, many assumptions of height control, as indicated by a temperature log alone, may in fact conceal an environment of excessive height growth and lead to premature screenouts.