Look at these data derived from Piagetian-type interviews. Do textbooks and state curriculum guidelines ever consider the limited thinking skills of children?

when studies have been done thruout the country they show that th majority of students do not have the rational problem solving powers to understand the concepts that are attempting to be taught. This study comes from Renner ( dr. leyden's teacher one summer in Oklahoma )

**piagetian interview results -- oklahoma**
grade	tested	concrete	transition	formal
7th	96 kids	80	13	3
8th	108 kids	83	19	6
9th	94 kids	77	5	9
10th	94 kids	68	16	10
11th	99 kids	70	17	12
12th	97 kids	64	15	18

this data came from a teacher in colorado -- but i don't know it's original source

**students reaching various piagetian stages**
age	pre-op	concrete onset	concrete mature	formal onset	formal mature
5	85%	15%	0	0	0
6	60%	35%	5%	0	0
7	35%	55%	10%	0	0
8	25%	55%	20%	0	0
9	15%	55%	30%	0	0
10	12%	52%	35%	1%	0
11	6%	49%	40%	5%	0
12	5%	32%	51%	12%	0
13	2%	34%	44%	14%	6%
14	1%	32%	43%	15%	9%
15	1%	14%	53%	19%	13%
16	1%	15%	54%	17%	13%
17	3%	19%	47%	19%	12%
18	1%	15%	50%	15%	19%

bottom line:
just because kids have big bodies -- doesn't insure that their thinking skills are "big" 9/28s/96