You're welcome. It has been a long time since I use this technique last time. :)
>
>You're a genious! It's finally working now. Thanks a lot.
>
>Mon
>
>>Try

>>Variable: rnUnSt
>>Value to Store = IIF(rnLines=1, 1,0)
>>Initial Value = 0
>>Calculation Type: Sum
>>Reset At:Group: Tutor
>>

>>>I like your ideas. Unfortunately the variable shows the number of sign-ins (count of detail line) and not the number of students. It seems this simple task is a big challenge in the FRX.
>>>
>>>Mon
>>>
>>>>It can also be done with Report Variables. Try

>>>>Variable: rnLines
>>>>Value to Store = 0
>>>>Initial Value = 0
>>>>Calculation Type: Count
>>>>Reset At:Group: Student
>>>>
>>>>Variable: rnUnSt
>>>>Value to Store = IIF(rnLines=1, 1,0)
>>>>Initial Value = 0
>>>>Calculation Type: Count
>>>>Reset At:Group: Tutor
>>>>