What is Performance Improvement and how to enhance it? CPTD 3.5

Having started preparation for the CPTD Certification, I am preparing for this weeks study group chapter, which is on Performance Improvement. Performance Improvement has these sub-chapters as reading as per the certification topics: Performance Improvement 3.5.6 Skill in designing and implementing performance support systems and tools (for example instructional, resources, data, process models, job aids,…