This book constitutes the refereed post-conference proceedings of the 16th International Conference on Persuasive Technology, PERSUASIVE 2021, held as a virtual event, in April 2021.

Positing A Sense of Agency-Aware Persuasive AI - Its Theoretical and Computational Frameworks.- Designing Effective Dialogue Content for a Virtual Coaching Team Using the Interaction Process Analysis and Interpersonal Circumplex Models.- Towards Adaptive Robotic Tutors in Universities: A Field Study.- Predicting Exercise Adherence and Physical Activity in Older Adults Based on Tablet Engagement: A Post Hoc Study.- Towards an Automatic Generation of Persuasive Messages.- Persuasive Social Robot using Reward Power over Repeated Instance of Persuasion.- Planning Habit: Daily Planning Prompts with Alexa.- Emotional Feedback to Mitigate Aggressive Driving: A Real-World Driving Study.- Mobile Persuasive Application for Responsible Alcohol Use: Drivers for Use and Impact of Social Influence Strategies.- Improving Context-Aware Habit-Support Interventions Using Egocentric Visual Contexts.- Disparate Impact Diminishes Consumer Trust Even for Advantaged Users.- Towards Better Rating Scale Design : An Experimental Analysis on the Influence of User Preference and Visual Cues on User Response.- From Persuasive to Credible: Which User Perceptions of Persuasive Design Elements Influence Perceived Credibility.- Exploring the Impact of Persuasive Features on Customer Satisfaction Levels of E-Commerce Websites Based on the Kano Model.- The Role of Emotional Expression in Behavior Change Coaching by a Social Robot.- Exploring the Impact of Color on User Ratings: A Personality and Culture-Based Approach.- Making Them Use It: User Perceptions that Determine the Acceptance of Persuasive Interventions for Child Healthcare.- A Systematic Review of Persuasive Strategies in Mobile E-Commerce Applications and Their Implementations.- Using Inspiration Cards for Designing Persuasive Technology to Improve Creative Situations.- Users Want Diverse, Multiple, and Personalized Behavior Change Support: Need-Finding Survey.- Theory-Informed Design Guidelines for Shared Decision Making Tools for Health Behaviour Change.- Perceptions of Ethics in Persuasive User Interfaces.- The Fine Line between Persuasion and Digital Addiction.- Defining Features of Behavior Design - and Where to Go Next.- Do we Need User Manuals for Persuasive Systems or are the Systems Supposed to be Self-Explanatory.