REQUEST - When to apply EAC

 Hi folks,

 

Need help in understanding when to apply which formula, especially the following:

EAC ‘no variances’ = BAC / CPI

EAC ‘fundamentally flawed’ = AC + ETC

EAC ‘atypical’ = AC + BAC - EV

EAC ‘typical’ = AC + ((BAC - EV) / CPI)

ETC = EAC - AC

ETC ‘atypical’ = BAC - EV

ETC ‘typical’ = (BAC - EV) / CPI

ETC ‘flawed’ = new estimate