I learned "a lot" the one time I participated in "group quilt making" - the project seemed simple enough - cut 1.5 inch wide strips, sew four strips together, and cut that unit into 4.5 squares.
It starts out with small variations with the cutting, continues with small variations with the the seam width, small variations with pressing techniques - and so on.
We ended up cutting the four-strip units into four inch squares!