Objectives: This protocol addresses the first phase of a larger project funded by the Patient-Centered Outcomes Research Institute to help heavy smokers make informed decisions about lung cancer screening with low-dose computed tomography (CT). A separate IRB protocol will be submitted for the larger, comparative study. In this initial development phase, our prototype patient decision aid will be updated to reflect current guidelines about lung cancer screening. The updated aid will then be pilot-tested in a new sample of patients. In addition, several of the study measures will be refined and further developed in preparation for the larger study. The specific aims of the measures and decision aid development phase of this project are as follows: Update the aid to reflect current screening guidelines and refine the aid via cognitive testing with patients/smokers; and pilot test the updated aid for acceptability with patients/smokers. Modify our current measure of lung cancer knowledge, conduct cognitive testing of the new measure with patients/smokers, and evaluate the reliability of the new measure in a sample patients/smokers.