If you only want to display records where there is an entry for both Most and Least then in your query have Is Not Null for both fields and on the same criteria line.
If you want records displayed where either Most or Least have an entry then put Is Not Null on the first criteria line for Most and the second criteria line for Least as that results in an Or situation
The question here is what sort of table structure are you querying? If all these "records" are coming from different fields in a table, then you may want to look at some crosstab queries. If all the fields are coming from the same record, the NULL functions are what you should be looking at.
This is similar to a problem I've run into before. For me it was using sales figures from a previous record to generate a running total of current inventory levels for that week... Anyhow to answer you question and to the best of my knowledge...
You CANNOT solve this problem using queries alone.
The way I've been getting around this is to use code. If I have some time I'll try to sqeeze in a sample. Unless Mike or someone else beats me to it first.
From her examples it would appear that she does not have any relationship between the answers for Most and the answers for Least. In other words she wants a list with all the Most answers next to a list with all the Least answers.
If that is the case then I would make a table that contained only the Most answers and another table that contained only the Least answers and each table would have a second field with no entries.
I would then go to the table with the least entries, let's say it is the one with the Least entries and copy the column and then go to the table with the Most entries and paste into the second field.