The field of the invention relates to methods and systems for comparing goods or services from websites, databases or other on-line resources. The field of the invention includes related servers, user terminals and computer program products. There is provided a method of comparing goods and/or services from one or more websites or other on-line resource(s) in which a multi-objective optimization process is used to identify a set of specific goods and/or services that optimally match user-defined and/or user-associated criteria and then that set of specific goods and/or services is displayed on an end-user's computing device to enable the end-user to view that set and optionally purchase one or more items from that set.