Finding a ball less in weight than other 6 balls outof 7 balls.

Questions:

There are 7 balls which looks similar in shape. however 6 balls are of same weight and one ball is some what less in weight than other 6 balls.
you have a weighing scale.

how you will find ball with less weight with two scaling attempts ?

answers.

1 scaling: -- weight 3 balls against 3 balls
if it weigh's equal it means remaing ball is the smaller one.
if one of the side lower than other then do the second scaling with those 3 balls

2 scalling:
1 against 1.
if equal remaining will be smaller else one of the balls currently weighing is smaller.