When developing a text messaging program, messages should be designed in a way that will have an impact on the target audience. Messages are more effective when they are carefully composed according to the target audience characteristics, motivators, and the desired outcomes of the program. Additionally, messages can be tailored and personalized for each individual. This guide is not a review of those theories. Sources with further information on designing SMS communication campaigns are located in the Useful Links and Resources. This section will discuss how to analyze and engage your audience, and create a theory-based text message intervention.