Question juridique clé
Whether the appeal against the cantonal remand decision was admissible under Art. 93 BGG.
Solution extraite
The remand decision was an interlocutory decision and no irreversible prejudice or immediate final decision saving substantial effort was shown.
Motifs extraits
A remand for further investigation and new decision normally causes no irreparable harm; the appellant failed to substantiate either condition of Art. 93(1) BGG, and any challenge to the mixed method could be raised later with the final decision.