As I understand it a Gettier case happens when there is a true belief that is justified but only by luck.
Common scenarios include
- looking at a broken watch and it just happens to be the time on that watch. You believe it's that time, it's true that it is that time and you're justified in that belief because the watch says so but it's not real knowledge because the clock is broken.
- A farmer sees a large fluffy dog in the distance thinking it's a sheep and based on his observation he believes there is a sheep in the field. Because he thinks it's a sheep he's justified in his belief. Out of the farmers view there happens to be a sheep in the field making his belief true.
In those two cases and the few other cases I've heard it seems to me that the justification part of the equation isn't good enough for it to be considered real justification. What is the criteria for justification?