Testing today of a several hundred million transistor System-on-Chip with analog, RF blocks, many processor cores and tens of memories is a huge task. What will test technology be like in year 2020 with hundreds of billions of transistors on a single chip? Can we get there with tweaks to today’s technology? While the exact nature of the circuit styles, architectural innovations and product innovations in year 2020 are highly speculative at this point, we examine the impact of likely design and process technology trends on testing methods.