I'm afraid that's not quite what I need. I find that I have to use the ISNUMBER and SEARCH Functions because The criteria in the example cell of G5 will not always match the data entered into the range (TASKS and TASKS_2) because a cell may have more than one value.
Currently my full formula is...
=IF(G5=0,0,SUMPRODUCT(--ISNUMBER(SEARCH(G5," "&Tasks&" "))))
The context behind the code is that the people on this tab have certain available tasks that are listed. G5 contains such as task. However, Person A can work on the task in G5, but can also work on tasks G6 and G7. In this case, the user would simply put those corresponding values in the TASK range for person A into one cell. The SEARCH Formula picks that up because of the multiple values in the cell.
Now, there is a copy of this sheet for another group. Originally group 2 could not work on group 1's tasks. They can now. So if Person X in group 2 wants to work on task G5 (from group 1), I need to account for that person in the above formula.
However, I'm having issues modifying the formula to put an addition for the range TASK_2. Hopefully this helps shed some light on the issue.
Thanks again!