What if your drying operation could run close to the upper moisture limit boundary of your product specification, yet never exceed it? Say your product is powdered milk. If you overdry it, you give away product and spend more money on energy. Plus, you’re not running to the capacity that is possible to achieve because it takes longer to dry the product (hence, less product throughput). With conventional control (e.g., PID), you’re chasing ever-changing environmental/process conditions and incoming product variability. So, by the time you try to compensate, you’re off-spec again, and your product is probably too dry. What are your options?