I am currently working on a tracking page where I've been asked to create a "Progress" column using Harvey Balls. The goal is to use empty, half and full to represent not started, in progress and complete by training module (children) and then overall. Below is one of the many formulas I've been working on.
=IF(AND(COUNTIF(CHILDREN(), "Half") = 0, COUNTIF(CHILDREN(), "Empty") = 0), "Full", "Empty")
(AND(COUNTIF(CHILDREN(), "Half") = 1, COUNTIF(CHILDREN(), "Full"= 0", "Half", "Empty")