intention function. Formula In its simplest form, the TRA can be expressed as the following equation: where: BI = behavioral intention (AB) = one's attitude toward performing the behavior W = empirically derived weights SN = one's subjective norm related to performing the behavior Conditions The TRA theorists note that there are three conditions that can affect the relationship between behavioral intention and behavior. The first condition is that "the measure of intention must correspond with respect to their levels of specificity". This means that to predict a specific behavior, the behavioral intention must be equally specific. The second condition is that there must be "stability of intentions between time of measurement and performance of behavior". The intention must remain the same between the time that it is given and the time that the behavior is performed. The third condition is "the degree to which carrying out the intention is under the volitional control of the individual". The individual always has the control of whether or not to perform the behavior. These conditions have to do with the transition from verbal responses to actual behavior. Scope and limitations Scope While Fishbein and Ajzen developed the TRA within the field of health to understand health behaviors, the theorists asserted that TRA could be applied in any given context to understand and even predict any human behavior. According to Sheppard et al., behavioral intention can predict the performance of "any voluntary act, unless intent changes prior to the performance or unless the intention measure does not correspond to the behavioral criterion in terms of action, target, context, time-frame and/or specificity". Their statement asserts that according to TRA, the measure of behavioral intention can predict whether or not an individual will perform a certain act, as long as the behavioral intention remains the same and the behavior is clearly and properly defined. Broadening the scope of TRA, Sheppard conducted a study in which they applied TRA in situations that did not completely comply or conform with Fishbein and Ajzen's framework. Surveying 87 previous empirical studies, they applied the theory in contexts where the individual did not have full volitional control over the behavior and/or where individuals did not have all the information to develop the intention. To their surprise, they found that TRA could successfully be applied in situations that did not fully adhere to the three formal terms and conditions specified by