Andrew, a 4-year-old, received a firetruck Lego set for his…

Andrew, a 4-year-old, received a firetruck Lego set for his birthday. The Lego set says that it is designed for 6-8 year olds. However, under the guidance and direction of his father, Andrew is able to put together the majority of the Lego set. This task is considered within Andrew’s __________.