EXPERIMENTATION
OBSERVATION
CONCLUSIONS
HYPOTHESIS
EVALUATION
CONTROLLED
CUMULATIVE
PREDICTIVE
VERIFIABLE
DEDUCTIVE
INDUCTIVE
ORIGINAL
PROBLEM
U
U
F
N
I
X
T
O
R
I
G
I
N
A
L
M
A
R
V
W
V
E
R
I
F
I
A
B
L
E
K
Z
O
X
N
P
D
J
I
I
A
X
E
Q
C
O
N
T
R
O
L
L
E
D
O
P
V
O
I
J
L
I
V
T
H
K
O
E
V
S
A
O
W
P
I
T
A
O
T
W
J
P
I
X
P
U
B
Y
E
A
D
U
L
O
T
X
A
I
W
A
U
I
T
L
U
E
S
C
V
X
U
P
N
F
A
A
N
M
I
I
S
C
A
Y
Z
I
E
X
A
K
X
E
X
M
T
U
Z
E
N
L
H
O
L
I
U
I
R
Z
L
V
P
C
W
F
N
A
I
L
D
E
S
H
U
C
S
A
V
U
U
E
R
S
V
O
E
N
P
B
U
O
D
X
M
K
I
L
A
H
A
B
E
L
Y
E
M
H
U
O
C
S
U
R
U
F
S
T
T
O
T
R
D
B
L
B
I
C
V
R
T
O
B
E
C
A
E
Y
I
B
I
Y
I
E
E
W
R
O
E
P
I
I
U
V
I
K
H
O
O
L
O
D
C
V
U
Q
E
E
O
I
V
R
L
I
J
S
T
F
N
J
N
A
T
O
R
O
P
I
E
V
E
B
E
T
Y
R
O
E
V
X
A
I
I
N
O
I
X
B
I
Z
E
O
U
C
W
T
P
U
T
E
T
J
V
U
X
D
E
K
E
H
I
A
U
U
K
G
Y
B
O
W
I
A
E
T
Y
I
N
Y
O
V
Q
X
A
D
X
C
H
R
E
E
R
C
O
L
A
P
U
M
W
W
R
M
A
E
I
L
O
C
O
N
C
L
U
S
I
O
N
S
I
O
E
O
D
D
A
O
O
W
G
I
J
O
X
R
A
A
A
S
I
O
W
Z
