Troubleshooting Process Plant Control 3rd Edition: A Practical Guide to Avoiding and Correcting Mistakes by Norman P. Lieberman book pdf download. Process control is an area of study dealing with controlling variables that emerge in process plants, such as chemical plants, wastewater purification plants, or refineries. Existing guides to process control are numerous, but they tend to be associated with control engineering, which is more mathematical and theoretical. There is an urgent need for a more straightforward and concrete guide for practical use in petrochemical plants and refineries.