Hello. I have encountred a problem during analysis of response in CCF design (4 factors). I have a strong confidence about validity of my response data but yet two points are indicated as outliers. These are axial points. I am wondering if it is possible that in CCF design axial points differ from factorial points in its potential to become outliers (I have noticed that each factorial point in my design has two similar points differing in only one factor and axial points do not have such similar points)? Does this two axial point outliers are showing me that I have to enhance my design and perform additional experiments to find model that would explain this outliers? Thanks in advance for any help!!!