"This guide does not require prior knowledge or experience in behavioral science. It will be relevant for you if you are an actor in a humanitarian setting look to: 1. Design a Theory of Change for a program aiming to change people’s beliefs or behaviors: This guide can be used by several actors. For instance, program managers seeking to increase the uptake of COVID-19 vaccinations by countering scientifically incorrect information can rely on the insights provided here. Or it can also be used by a humanitarian who is developing a Theory of Change for promoting preventive health behaviors. This guide offers practical entry points to take into account when identifying what factors will influence how your information might develop the impact you are hoping to have and ultimately achieve the change you are pursuing. 2. Design communication strategies or information campaigns: This guide can be used by anyone who is grappling with the question of how to make an information campaign more effective by outlining concrete steps that new or existing communication interventions can take to effectively change people’s perceptions, beliefs and behaviors, within humanitarian settings. 3. Think about how to contextualize behavioral insights to design better information campaigns: It is necessary to ask afresh in each situation how exactly context influences the behavioral insights that determine uptake or dismissal of information. This guide provides a checklist for how to contextualize behavioral insights to specific social, political and cultural situations of humanitarian settings. In program design phase, where feedback is gathered from communities for co-created solutions, this checklist can help with deeper and behaviorallyinformed contextualisation." (How to use this guide)