Sergey,

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
>>>