The one-line system enables the children to read the three-note melodies without difficulty. Open string is under the line and the notes played by the stopping first finger are always on the line and notes played by the stopping second finger are always above the line. The one-line system not only takes away the reading burden but activates the child to write his/her own three-note compositions on the line system. Reading and writing home works may activate also the parents.
Transposing with the help of relative solmization starts.