The reliability of infrastructure index has six components:
- How land titles are kept at the registry of the largest business city of the economy. A score of 2 is assigned if the majority of land titles are fully digital; 1 if the majority are scanned; 0 if the majority are kept in paper format.
- Whether there is an electronic database for checking for encumbrances. A score of 1 is assigned if yes; 0 if no.
- How maps of land plots are kept at the mapping agency of the largest business city of the economy. A score of 2 is assigned if the majority of maps are fully digital; 1 if the majority are scanned; 0 if the majority are kept in paper format.
- Whether there is a geographic information system—an electronic database for recording boundaries, checking plans and providing cadastral information. A score of 1 is assigned if yes; 0 if no.
- How the land ownership registry and mapping agency are linked. A score of 1 is assigned if information about land ownership and maps are kept in a single database or in linked databases; 0 if there is no connection between the different databases.
- How immovable property is identified. A score of 1 is assigned if there is a unique number to identify properties for the majority of land plots; 0 if there are multiple identifiers.
The index ranges from 0 to 8, with higher values indicating a higher quality of infrastructure for ensuring the reliability of information on property titles and boundaries.
In Turkey, for example, the land registry offices in Istanbul maintain titles in a fully digital format (a score of 2) and have a fully electronic database to check for encumbrances (a score of 1). The Cadastral Directorate offices in Istanbul have digital maps (a score of 2), and the Geographical Information Directorate has a public portal allowing users to check the plans and cadastral information on parcels along with satellite images (a score of 1). Databases about land ownership and maps are linked to each other through the TAKBIS system, an integrated information system for the land registry offices and cadastral offices (a score of 1). Finally, there is a unique identifying number for properties (a score of 1). Adding these numbers gives Turkey a score of 8 on the reliability of infrastructure index.