Explain the various stages in the evolution of gateways content
Science gateways are a key driver of the democratization of access to computing and data resources in science and engineering research. Science gateway technology has evolved in tandem with modern web technologies and adopts several standard design principles that have accelerated their development. The evolution of science gateways and their most common components are discussed, followed by some examples of popular gateways adopted by the GIS community. The challenges faced by modern gateways in response to user needs and evolving technologies are presented to drive further discussion and development.