We don't know. ITER is the big-scale, brute-force approach. People suspect there may be smart ways to do better with less, but until either succeed that's anyo

We don't know. ITER is the big-scale, brute-force approach. People suspect there may be smart ways to do better with less, but until either succeed that's anyone's guess. ITER is a tokamak. That's one approach. There is also the inertial confinement approach, that more efficient LED lasers have made an interesting contender. There is the stellarator approach, aka the "smart tokamak" experimented in Germany. Another one is the Z-pinch, used in Z machines, which seem to focus more on nuclear weapons research but that could potentially be a way towards usable fusion. What makes ITER a likely candidate is solely its funding. I wish we funded the others to a similar amount. And in each approach, there are also several ways of doing things.