Introduction: The healthcare sector significantly contributes to environmental degradation, highlighting the need for sustainable practices. Green Lean Six Sigma (GLSS) offers a relevant and impactful approach to reduce healthcare's environmental footprint while improving efficiency. By incorporating environmental considerations into Lean Six Sigma, GLSS has the potential to mitigate healthcare's environmental impact and promote environmental sustainability. This study aims to gain insight into healthcare professionals' experiences with GLSS at their workplace. Materials and Methods: This qualitative exploratory study employed semi-structured surveys based on theory of training evaluation from Kirkpatrick with Dutch healthcare professionals in the first six to eight months after completing GLSS training. Results: Even though 76% (N = 16) of trained healthcare professionals applied GLSS at their workplace and 43% of them (N = 9) completed a project within the first six to eight months after training, they all experienced one or more barriers. The most frequently reported barriers were lack of time, difficulties with project selection and a lack of management support. GLSS project results included reduction of products, energy, costs and travel, green choices in procurement and sustainable food choices. GLSS also helped to create awareness on the environmental impact of healthcare and to optimize processes by reducing costs, waiting time, workload and defects. Discussion: This is the first study to report experiences from applying GLSS in healthcare. Furthermore, it is the first study presenting GLSS training evaluation results in terms of participant behaviour and organizational outcomes. Conclusions: Results of this study can be used to enhance GLSS deployment programs and to optimize organizational settings for successful GLSS implementation in healthcare.
Keywords: GLSS; barriers; healthcare; nursing; sustainability; training evaluation.