This is one of the most challenging stages in the AIDA model: you've got the attention of a chunk of your target audience,

Gaining the reader's interest is a deeper process than grabbing their attention. They will give you a little more time to do it, but you must stay focused on their needs. This means helping him or her to pick out the messages that are relevant to him quickly – use bullets and subheadings, and break up the text to make your points stand out.

For more information on understanding your target audience's interests and expectations, and the context of your message, read our article on the Rhetorical Triangle.