Five areas commonly used in the measurement of asthma were examined. These are the clinical examination, history, pulmonary physiology, medication requirements, and school activity levels. Correlations between these measurements were possible by using two investigations in order to provide the necessary data. The value and shortcomings of each of these measures are discussed. The need for frequent observations has been shown in order to improve the low order of correlations obtained, even with those that are statistically significant. All five measurements are a requirement if research in this field is contemplated. © 1968.