Data collection issues
Errors in individual data, systematic errors, a system that is not open to analysis… All of them lead to an inevitable error in something as important and subjective as human sciences.
In a very different way to natural sciences this focus on the human level, which we still have not understand. It is easier to commit mistakes because we are the ones affecting the system and the human world can sometimes be impredictible just because we create the rules. We can change in base to a study or result, that is the reason Human sciences are not as reliable but as important as natural .sciences. Natural sciences can help us to understand ourselves better and make this social and human sciences more accurate and better