This model associates users’ emotions and routines with a product, to get them to return to the product again and again. Nir states habit-forming products start by altering users with external triggers such as a link, email, or an app icon. The internal triggers are usually driven by users’ emotions and memory associations. As different products promise the power to relieve these emotions, the mind begins to associate them with relief. Thus, to design a habit-forming product it is important to understand emotions associated with different triggers and how external factors can be used.