=isnumber(match(a1,sheet2!a:a,0))

My list is in Sheet2, column A (and nothing else is there).

And I'm checking the value in A1 of the activesheet.

Bullman wrote:

Hello

I have only started to use and realise the power of using named lists
to represent a range of values. I am sure it is a simple thing to do,
but what is the easiest logical formula test that will look at a cell
and return a TRUE value if the entry in the cell belongs to a
pre-defined named list and a FALSE value if it does not.

Thanks in advance

Bullman

--

Dave Peterson