There are several ways to use this reward system.

Do you want your child to be Pampers free?

There is a heart for every toilet visit.

Small 1 heart.

Large 2 hearts.

When everything is full, there is a small reward. for example an ice cream.

or for tidying up the room.

take out the garbage.

or or or or

The man doesn't help properly around the house?

Let him collect hearts and give him a reward when they are full.

the possible uses are extensive