This part outlines a systematic framework for selecting and optimizing feeding strategies in industrial fermentation processes. The text provides a step-by-step decision tree that helps engineers choose between batch, fed-batch, and continuous operations based on biological traits and engineering constraints. It emphasizes managing metabolic overflow and oxygen transfer limits to maintain product quality and high yields. Detailed case studies illustrate how specific substrate-organism pairs, such as E. coli producing recombinant proteins, require tailored control philosophies like DO-stat or exponential feeding. Ultimately, the source serves as a technical manual for aligning feed logic with scale-up realities to prevent cellular stress and unwanted by-products.