Mobile First
Mobile First

Definition
Mobile first is a strategy for site design that means designing the online experience for mobile web before desktop web. The rationale is that it is better to design for the smallest screen size first as it is the most challenging user interface to produce. It is also the fastest growing and now most popular method of searching the web.
People often have different goals depending upon which device they are using. As a result allowance needs to be made for mobile users’ distinctive triggers and motivations. This may mean that your success metrics for conversion also needs to be different from desktop.
Also see mobile optimisation and mobile optimised copy.
Resources:
Conversion marketing – Glossary of Conversion Marketing.
Mobile only – Why is your customer journey leaking cash?
Over 300 tools reviewed – Digital Marketing Toolbox.
A/B testing solutions – Which A/B testing tool should you choose?
Types of A/B tests – How to optimise your website’s performance using A/B testing.