Closure is key to successful interactive design. The premise is that a user seeks an outcome from engaging in interaction. Closure is satisfying this need by providing an appropriate endpoint or a meaningful transition to an alternative form of interaction.
In the context of web communication, closure usually involves answering a question; for example; “Where are your offices?”, “How much does your service cost?”, “What are the regulations for this activity?”,
An effective needs analysis will identify such questions in advance to ensure that a website provides either an answer, or an alternative means by which the answer may be found; e.g. “Call our 0800 number for details”, “See www.answers.com for more.”, “Send your details to receive a free pamphlet”.
The principle of closure also applies to the creation of online entertainment, a successful entertainment website will satisfy the user’s need for trivia, challenge, culture, etc.