Starting point
The process begins with the owner named in the property documents, dates and places connected with that person, and known relatives.
Sources
Civil-status records, archives, court files, residence records, obituaries and other reliable materials may be used. Sources must be connected and evaluated, not merely collected.
Current data
Historical links must be connected with current facts: name changes, emigration, deaths and possible contact channels.
Outcome
The outcome should be an organised view of persons, relationships, possible rights and missing evidence as a basis for further action.