Number of Items on

Percent of Item increase - WISC-III to

Number of WISC-III Items Retained on

Percent of WISC-III Items Retained on

Number of New Items Written or Reworded

Percent of New Items Written or reworded

Subtest

WISC-III

WISC-IV

WISC-IV

WISC-IV

WISC-IV

for WISC-IV

for WISC-IV

Verbal/Verbal Comprehension

Information

30

33

10.0%

22

73.3%

11

33.3%

Similarities

19

23

21.1%

12

63.2%

11

47.8%

Vocabulary

30

36

20.0%

27

90.0%

9

25.0%

Comprehension

18

21

16.7%

10

55.6%

11

52.4%

Word Reasoning

24

24

100.0%

Performance/Perceptual Reasoning

Picture Completion

30

38

26.7%

27

90.0%

12

31.6%

Picture Arrangement

14

Dropped

Block Design

12

14

16.7%

10

83.3%

4

28.6%

Object Assembly

Dropped

Mazes

10

Dropped

Picture Concepts

28

28

100.0%

Matrix Reasoning

35

35

100.0%

Processing Speed

Symbols Search

45**/45***

45**/60***

33.3%

45

100.0%

15

25.0%

Coding

59** / 119***

59** / 119***

0.0%

59** / 119***

100.0%

0

0.0%

Cancellation

640

640

100.0%

Freedom from Distractibility/Working Memory

Digit Span*

30

36

20.0%

31

103.3%

5

13.9%

Arithmetic

24

34

41.7%

12

50.0%

22

64.7%

Letter-Number Sequence

10

10

100.0%

Total

Verbal/Verbal Comprehension

97

137

41.2%

71

73.2%

66

48.2%

Performance/Perceptual Reasoning

66

115

74.2%

37

56.1%

79

68.7%

Processing Speed

104**/164***

744**/819***

615.4%

104**/164***

655

88.0%

Freedom from Distractibility/Working Memory

54

80

48.1%

43

37

46.3%

Full Scale

321**/381***

1076**/1151***

235.2%

255**/315***

79.4%

837

77.8%

Note: Subtests in italic are new to the WISC-IV. * Digit Span retained the same number series with the exception of 3 series having only 1 number changed ** refers to Form A, *** refers to Form B

The number and percent of items retained from the WISC-III to