The document discusses the importance of measuring the return on investment (ROI) of training programs, emphasizing that traditional models (Kirkpatrick and Phillips) fall short by not incorporating sustainability and real behavior change post-training. It advocates for a focus on ensuring that learned skills are applied and maintained in the workplace, thereby facilitating long-term benefits for organizations. The author aims to redefine training evaluation by proposing a 'missing level' that prioritizes the sustainability of learning impacts.