on the situation in which interaction occurs and the relationship between sender and receiver. 1. Sender and receiver cognition and behaviors vary, since deceptive communication contexts vary in access to social cues, immediacy, relationship, conversational demands and spontaneity. 2. In deceptive interchanges, sender and receiver cognition and behaviors vary; relationships vary in familiarity (informational and behavioral) and valence. Other factors before interaction Individuals approach deceptive exchanges with factors such as expectancy, knowledge, goals or intentions and behaviors reflecting their communication competence. IDT posits that these factors influence the deceptive exchange. 3. Compared with truth-tellers, deceivers engage in more strategic activity designed to manage information, behavior and image and have more nonstrategic arousal cues, negative and muted affect and non-involvement. Effects on sender's deception and fear of detection IDT posits that factors before the interaction influence the sender's deception and fear of detection. 4. Context moderates deception; increased interaction produces greater strategic activity (information, behavior and image management) and reduced nonstrategic activity (arousal or muted affect) over time. 5. Initial expectations of honesty are related to the degree of interactivity and the relationship between sender and receiver. 6. Deceivers' fear of detection and associated strategic activity are inversely related to expectations of honesty, a function of context and relationship quality. 7. Goals and motivation influence behavior. 8. As receivers' informational, behavioral and relational familiarity increase, deceivers have a greater fear of detection and exhibit more strategic information, behavior and image management and nonstrategic leakage behavior. 9. Skilled senders convey a truthful demeanor, with more strategic behavior and less nonstrategic leakage, better than unskilled ones. Effects on receiver cognition IDT also posits that factors before the interaction, combined with initial behavior, affect receiver suspicion and detection accuracy. 10. Receiver judgment of sender credibility is related to receiver truth biases, context interactivity, sender encoding skills and sender deviation from expected patterns. 11. Detection accuracy is related to receiver truth biases, context interactivity, sender encoding skills, informational and behavioral familiarity, receiver decoding skills and sender deviation from expected patterns. Interaction patterns IDT describes receiver suspicion and sender reaction. 12. Receiver suspicion is displayed in a combination of strategic and nonstrategic behavior. 13. Senders perceive suspicion. 14. Suspicion, perceived or actual, increases senders' strategic and nonstrategic behavior. 15. Deception and suspicion displays change over time. 16. Reciprocity is the predominant interaction pattern between senders and receivers during interpersonal deception. Outcomes IDT posits that interaction between