Audience Engagement differs from Audience Response in that ‘Engagement’ is a two way flow of ideas and ‘Response’ is an opinion to a predetermined set of ideas. Audience Engagement is usually deployed in a service or system that gives the delegates the ability to submit ‘free text’ comment to the congress. Typically using networked laptops or tablets, like iPads. Delegates may ‘Bring Your Own Device’ (BYOD) which is an increasingly popular option. BYOD allows you to join the congress and ensure your opinion is heard while reducing cost from equipment hire, after all why hire hardware when delegates have the necessary equipment with them to participate already.