Introduction or Background information

Similar to abstracts, these types of sections are not suited to web writing. They slow down users and stop them getting to the main messages of the content. 

Online users want information quickly and easily, so include the most important information first; think of the inverted pyramid. Any background information should be included based on order of importance for the user and weaved into the main analysis or information sections. 

Any information on data sources, quality, recent changes and methods should be included in the Data sources and quality section.