https://icsid.worldbank.org/procedures/arbitration/convention/process/manifest-lack-legal-merit/2006#:~:text=Arbitration%20Rule%2041(5)%20provides,preliminary%20stage%20of%20a%20proceeding.

Manifest Lack of Legal Merit - ICSID Convention Arbitration (2006 Rules)

Arbitration Rule 41(5) provides an expedited procedure to dispose of unmeritorious claims at the preliminary stage of a proceeding. The rationale for the Rule is to allow claims that manifestly lack legal merit to be dismissed early in the process before they unnecessarily consume the parties’ resources. It applies to objections to jurisdiction as well as objections on the merits.

Rule 41(5) took effect on April 10, 2006, by an amendment to the ICSID Arbitration Rules. The drafting history of the Rule is found in paper published by the ICSID Secretariat: Possible Improvements of the Framework for ICSID Arbitration: Discussion Paper and Suggested Changes to the ICSID Rules and Regulations: Working Paper.