Video Transcript
Classification — 23–36 Months
Narrator: In the Cognitive Development domain, the strand Emergent Mathematical Thinking includes the foundation Classification. Children from 23 through 36 months sort objects into two or more groups based on similarities and differences in one characteristic. They sometimes name these groups, but the names may be overgeneralized.
Example 1
On screen text: Sorts based on one characteristic
On screen: 31-month-old Aliyah and her caregiver sit facing each other on the grass. Between them is a basket of colored balls. The caregiver watches Aliyah empty the basket and begin to sort the balls by color.
Aliyah picks up an orange ball and a green ball and places them to opposite sides of her body. She takes a yellow ball and places it between them. She places a white ball directly in front of her. Aliyah places a second yellow ball next to the first and puts a red ball near the other balls. She selects two more yellow balls and lines them up with the other yellow balls. SHe picks up the last two balls—a red ball and a white ball. She places the red ball next the other red ball and the white ball next to the other white ball.
The balls are grouped together according to color: two white, one orange, four yellow, one green, and two red.
Example 2
On screen text: Sorts based on one characteristic
On screen: 31-month-old Jet stands at a low table playing with small toy boats, trucks, school buses, and airplanes of various colors.
Jet picks up a red school bus.
Jet: Give me the school bus (inaudible).
On screen: Jet places the red school bus on the table.
Caregiver 1: Okay.
On screen: Jet reaches toward the tray of toy vehicles. He smiles and picks up a blue school bus. Jet picks up the red school bus and holds the two buses then sets them down side by side.
Jet: Oh, oh find one. Two school bus. School bus.
On screen: The caregiver moves the tray of vehicles closer to Jet.
Caregiver 1: Oh, you want a red one what? What are you doing?
On screen: Jet reaches and selects three more toys. He places another bus next to those already on the table.
Caregiver 1: Oh, you got it. Oh, the school bus.
Example 3
On screen text: Sorts based on one characteristic
On screen: 35-month-old Louis stands at a low table scattered with crayons. Near the crayons are colored cans: red, orange, yellow, green, blue, purple, brown, and black.
In the green can are one black, one orange, and one red crayon. While holding two orange crayons, Louis removes the black crayon from the green can and then places it in the black can. He briefly holds his two orange crayons over the red can before placing them in the orange can. He moves the orange crayon from the green can to the orange can.
A caregiver sits down across from him. Louis moves the red crayon from the green can to the red can. Louis picks up yellow and brown crayons from the table. The caregiver picks up a brown crayon for Louis to see.
Caregiver 2: Where’s the brown go?
On screen: The caregiver places the brown crayon on the table. Louis drops his yellow and brown crayons into the yellow can. He picks both crayons back up and places the brown crayon in the brown can and the yellow crayon in the yellow can.
Louis picks up the brown crayon the caregiver laid on the table. He briefly holds it over the green can before placing it in the brown can. Louis picks up purple and green crayons and places them in the purple and green cans.
Caregiver 2: You’ve got purple and green.
On screen: Louis picks up a blue crayon and places it in the blue can.
Caregiver 2: Blue. There it goes.