This unit portfolio for Week 3 of PPMP20012 discusses the relevance of systems engineering to project cases through the Portsmouth council case study and mandatory readings. The case study highlights the use of system engineering to identify the best course of action for solving problems. The process involves checking the demand, system purpose, capability, and flow of the management and execution services, planning valuable steps for enhancement, and implementing changes to eliminate existing issues. The practical application of system thinking is also discussed. Optional readings and references are provided for further learning.