This is a multiyear experimental research program focused on improving relevant material properties of high-T(sub c) superconductors (HTSs) and on development of fabrication methods that can be transferred to industry for production of commercial conductors. The development of teaming relationships through agreements with industrial partners is a key element of the Argonne National Laboratory (ANL) program. Recent results are presented on YBa(sub 2)Cu(sub 3)O(sub x) (Y-123) coated conductors, including fabrication by pulsed laser deposition (PLD) and sol-gel techniques. An approach to understanding the critical current density (J(sub c)) of grain boundaries is also presented and a technique is identified for increasing J(sub c).