The rapporteurs investigate the case files after research has been conducted at various archive centers.
The length of this phase depends mainly on the complexity of the case file. The rapporteurs must examine all documents in the case file, including those provided by the claimant and the results of archival research. Additional research is sometimes necessary.
It is therefore difficult to indicate the exact amount of time needed for investigation.
Refer also to the question/answer: Claim processing and timeframes.