All electors known to the system; electors are people believed to be entitled to vote in the current campaign.
All genders which may be assigned to electors.
All dwellings within addresses in the system; a dwelling is a house, flat or appartment in which electors live. Every address should have at least one dwelling; essentially, an address maps onto a street door and dwellings map onto what's behind that door. So a tenement or a block of flats would be one address with many dwellings.
Addresses of all buildings which contain dwellings.
All visits made by canvassers to dwellings in which opinions were recorded.
Authorities which may authenticate canvassers to the system.
Issues believed to be of interest to electors, about which they may have questions.
Intentions of electors to vote for options elicited in visits.
Primary users of the system: those actually interviewing electors.
Requests for a followup with an issue expert
A role (essentially, the same as a group, but application layer rather than database layer) of which a user may be a member.
Electoral districts: TODO: Shape (polygon) information will need to be added, for use in maps.
Actions taken on followup requests.
Options in the election or referendum being canvassed on