Advanced Undulators Comments 4 types in different length, types, and PPM/SCU, and large number of units Adopt zero magnetic force type to cancel strong magnetic force SCU: fabrication experience by making short version Fabrication and Field Measurement experiences accumulated through SR and SXFEL projects. Comments Any possibility of making standard frame (collaboration with BD team): Making same length of PPM undulators Use same frame for different magnetic arrays (possible by ZMFU?) FEL1 undulator: Do you really need ZMFU? (to reduce cost) In general, make common components as much as possible Make a strategy who will build large number of undulators: R&D by SCLF team and Prototyping with Industries Mass Production by multiple companies to reduce in-house manpower and production time Field measurements by SCLF team for final verification Prioritize which FEL line is firstly needed and so on…