What aspect of development includes skills such as handwriting and buttoning shirts?

Fine motor skills refer to the smaller muscle movements that are involved in tasks requiring precision, such as handwriting and buttoning shirts. These skills typically develop as children grow and are crucial for everyday activities that require dexterity and control. Fine motor skills include the use of the hands and fingers and are vital for tasks like tying shoelaces, using utensils, and performing artistic activities.

Gross motor skills, on the other hand, involve larger movements that require the use of larger muscles, such as running, jumping, or throwing. Life skills generally encompass a broader range of abilities needed for daily living, while coordination skills can refer to both gross and fine motor proficiency but do not specifically point to the precise movements required for tasks like handwriting or buttoning shirts. Thus, fine motor skills is the most accurate descriptor for the abilities mentioned in the question.