I have 3 variables to check against, but some of them require other checks and I am getting lost. See file attached; this is a follow-on query and relates to rows 22-35. I have included in the spreadsheet an image of the calculations I am trying to automate. I believe i need to validate in the order i have labelled them in the image - 3 cases. In essence I am trying to derive an S value for the 3 cases. I haven't built Eq1 because i though i could build it into an IF statement but now i am not too sure. Hope this makes sense.