What are the differences between obvious defects and quality issues?
Obvious defects are usually physical damages, which can be spotted by visual observation of product appearance, such as tear on cloth, broken glass, cut on handbag, crack on woods etc. Quality issues include a variety of different types which are not easy to be spotted by visual checking of product appearance, such as skipped stitch on the collar, petty scratch on metal, short life-time of bulb, slow reaction of tablet PC etc.