A Checklist outlining requirements and best practices for preparing and filing a motion for joinder in an inter partes review proceeding (IPR) before the Patent Trial and Appeal Board (PTAB) under 35 U.S.C. § 315(c) and 37 C.F.R. §§ 42.22 and 42.122(b). This Checklist identifies pre-filing tasks and considerations, motion content and format, and filing and service requirements.