In the absence of quality assessment of GI training, patient safety and evidence-based medical care cannot be guaranteed. According to major societies of GI endoscopy, the credentialing decisions for GI endoscopy should be based on the evaluation of physicians' qualifications and procedural skills, as assessed by experienced doctors with whom they have trained, not solely on a simple counting of procedures performed (9). Therefore, there is a need for a WEO training guideline that defines training duration, procedural skills and competency that should be acquired by young GI endoscopists during their endoscopy training.