I started using multiplan and lotus 123 in 1987, lotus 123 and Quattro pro with the first solvers in 1991, then excel 95, literally destroyed everything, all companies switched within a year, the rest is history So I know a thing or two about spreadsheets I am very very far from being a novice, I am not really concerned with CSE's as they are supposed to be replaced last year, In Australia no news of them ever arriving, I can not get an answer about why,but I have Mike Girvins thorough book, it is VBA arrays that are my main concern there is only sketchy detail out there the article went into great depth. I wish to do a lot of statistical calculations for probability tables in arrays as they really slow down spreadsheets and the normdist etc, functions are really slow. To use the hart algorithm of normal density approximation is quick and computationally inexpensive, but I do not want to fill up sheets with rows of unnecessary tables continually recalculating if it can be done seamlessly in a array in the background it will be quick and painless. I can save the module and use it many times in lots of applications. There is a sincere not frivolous reason why I seek such old wisdom, not all that is new that glitters is gold, there is still some old gold out there.