An exponential law of interface design

The first time a person interacts with your site, app, or product:

• The first two seconds will determine if the user invests four more seconds (What is this?)
• The next four seconds will determine if the user invests eight more seconds (Why is it useful?)
• The next eight seconds will determine if the user invests another sixteen (How does it work?)
• 16 -> 32 (How will I actually use it?)

And so on.

• The first day will determine if user invests a week (Does it work for me?)
• The first week will determine if the user invests a month (Is it improving my life?)
• The first month will determine if the user invests a year (Is it indispensable?)
• The first year will determine if the user will use it for a lifetime (Have I stopped thinking about it altogether?)

Structure your interface and experience so the user is always able to find enough information to continue the process.