Key legal question
Who may represent parties in invalidity insurance appeal proceedings, and what authorization is required for non-admitted representatives?
Extracted holding
In invalidity insurance appeal proceedings, representation is generally permissible, but the law leaves qualification rules to cantonal legislation. A representative without admission by the Obergericht must be expressly authorized in writing by the appellant to file the appeal.
Extracted reasoning
Article 69 IVG allows legal assistance in invalidity insurance recourse cases, but does not itself define who may act as representative. That matter is left to cantonal law. To avoid unauthorized practice, a non-admitted representative may only file the appeal if the appellant has given express written authority.