Is the statement "Control unit controls overall operations of computer." true or false I was tutoring a grade 4 student about CPU and I got confused as there are also the other units of a cpu like arithmetic and logic unit and memory unit. So, is the above statement actually true even if ALU is the one which does the arithmetic and logical operations?
Well true, sort of.

In simple terms: The control unit, regardless of how it is implemented, directs the activities of all of the other processor units.

However: It does so by decoding the instructions fetched from memory, the program. 

So ultimately the program controls what gets done.