In the 21st century, jobs are changing. Hard-hat jobs and manufacturing are declining while knowledge workers are in high demand. As we continue our week-long focus on the Voices and Choices campaign to revive Northeast Ohio, we're asking what's key to training workers not just for today, but for tomorrow, as well. There are no easy or uniform answers but experts agree: businesses won't come to the region unless they can find qualified workers. It's the Sound of Ideas - join the conversation Tuesday morning at nine on 90.3.Roy Church, president, Lorain County Community College; James McGuffin-Cawley, associate engineering dean, CWRU; Michael Keating, Expansion Management magazine; Jim Scozzie, VP Bio-Enterprise