EXTERNALVALIDITY
TOTALEDUCATION
EARLYGRADES
COSTBENEFIT
STUDENTTYPE
LIMITATIONS
CLASSSIZE
L
H
A
K
E
S
T
U
D
E
N
T
T
Y
P
E
Z
G
I
Y
Q
T
A
B
A
A
W
I
S
O
Y
K
N
N
Z
U
M
Q
T
N
V
A
O
O
G
E
V
P
L
E
C
O
V
C
I
T
I
I
L
O
O
I
D
T
I
E
U
Z
I
I
F
O
T
C
F
R
D
Z
H
A
J
Q
U
M
F
T
G
T
F
I
A
H
P
D
X
I
R
G
O
Z
I
U
A
H
A
A
B
I
T
E
O
X
F
G
L
B
O
A
E
H
E
C
X
C
S
I
I
G
U
U
Y
O
I
A
U
A
Z
T
L
I
J
U
O
S
O
M
I
L
D
K
S
E
V
K
P
A
A
U
N
D
I
T
N
O
R
C
O
R
Y
W
B
L
S
G
U
E
C
E
U
S
S
A
I
U
E
O
U
F
K
S
A
L
A
L
N
L
C
U
E
K
O
I
L
U
Q
F
S
H
T
N
J
E
J
A
R
O
V
C
C
X
P
W
V
I
X
I
R
V
R
W
N
T
I
J
E
K
O
D
P
I
Z
A
C
A
G
Z
Z
E
E
O
R
M
A
Q
T
O
V
E
F
I
U
X
K
R
J
Q
T
T
S
K
P
L
E
A
H
W
H
A
J
U
L
Y
U
M
D
X
F
E
E
O
O
Y
A
E
D
O
N
S
Q
L
B
J
K
U
E
U
E
X
U
N
T
I
F
E
N
E
B
T
S
O
C
U
Q
K
