PSIaps is a comprehensive solution for production planning. The software was designed to meet the complex requirements of the process industry. PSIaps supports the user during the entire planning cycle - from S&OP and capacity planning to production scheduling and material planning. The software allows the modeling of business processes for rough and fine planning. Different business scenarios may be analyzed in the system. PSIaps offers state-of-the-art optimization based on a detailed cost model, considering both technical restrictions and business rules. The software offers full stock calculations as well as lot size optimization. Furthermore, advanced concepts like vendor managed inventory (VMI) or available-to-promise (ATP) may be realized with the help of PSIaps. A user-friendly visual planning assistant gives options for interactive planning. A reporting package completes the solution.