Numerous companies throughout the world have adopted Software as a Service (SaaS), a subscription-based alternative to purchasing software. The "SaaS style" of operating must be adopted by marketing, just like by every other key business function. It has never been more important for marketing to consider the "whole funnel" of a customer's life cycle, from acquisition to renewal and expansion. The SaaS Model is a useful manual that instructs the reader on how to advertise a brand successfully in the SaaS era.