Arranged by Order of Difficulty on a Scale of 1.00 to 21.00
I (1.00) to psychology (20.10) and alphabetically from a (1.00), abandon
(13.80) to zone (3.70), zoo (2.95).
View Sample in pdf format or
scroll down to see sample from book.
The only scientific ranking of over 5,500 of the most commonly used
spelling words in exact order of statistically proven difficulty which was based
on the data derived from the late Harry Greene's The New Iowa Spelling Scale, University
of Iowa, which is included in the book.
A separate alphabetical listing of the over 5,500 most commonly used
spelling words with examples
of words of the same statistical level of difficulty so that teachers can properly
construct spell downs in which each round will contain words of exactly equal difficulty!
The rank ordering of the words enables any teacher as well as any researcher to quickly
validate or replicate the data regardless of the quality of the schools or the students.
It allows researchers and teachers to quickly determine the effectiveness of any
spelling series. Create a posttest with half of the words being words that had been
studied during the year. The other half will consist of words not taught but having the
exact statistical degree of difficulty. If the posttest gains on both parts are the
same, the gains can be attributed to natural incidental learning rather than the textbook.
Schools interested in having their spelling program scientifically evaluated
should contact Don McCabe, the Research Director of the
AVKO Foundation.
E-mail
info@avko.org or call
Toll Free (866) 285-6612.
A Partial Sample Page listing
equivalents by difficulty
Difficulty Factor
Words of Statistically Equivalent Spelling Difficulty
1.50
her was arebe going land long man my
play saw toy work
1.55
if add away back call cowboy room cat new
1.60
them bad came end fat hand his mother on read
this sun fun
1.65
cars food had hot part run same school show week
1.70
cow five give got him house little most oil put teawaynight
1.75
box bed down ago eat feet line times
1.80
about ball gave hard ran will bell do
has May milk say stop
1.85
face from moon pay when bank books mail thing top town wood
cap
1.90
letter more nut page sat save ship sotwodear fish tree age
1.95
bee June law side stay stone game hope low pie
six tell
A Partial Sample Page listing words alphabetically
giving Difficulty
Factors
(DF)
Target Word
DF
Target Word
DF
Target Word
DF
Target Word
DF
A-Amounting
accustomed.......
17.55
admire.............
8.25
ago.............
1.75
a................
1.00
ache....................
11.30
admired...........
9.35
agree..........
5.25
abandon.....
13.80
achievement.......
17.70
admission.......
12.80
agreeable..
13.55
ability...........
12.15
acid.....................
12.90
admit...............
9.55
agreed.......
7.45
able.............
3.30
acknowledge......
16.90
admitted..........
12.10
agreement.
9.10
about...........
1.80
acknowledged...
17.15
adopt...............
10.50
agricultural.
17.00
abroad........
8.70
acknowledging...
17.60
adopted..........
10.10
agriculture..
15.25
absence......
13.95
acknowledgment
18.55
adorable..........
11.05
ahead.........
3.40
absent.........
5.90
acquaint..............
18.35
advance..........
7.00
aid.............
5.25
absolute.....
14.25
acquaintance.....
19.25
advanced........
10.30
aim............
8.85
absolutely...
17.45
acquainted.........
18.35
advantage......
10.75
air.............
1.40
abstract......
11.95
acquire..............
17.20
advantages.....
12.20
airplane..
4.30
abundant....
15.25
acre...................
9.85
adventure........
7.95
airplanes..
6.60
abuse*.........
8.80
acres..................
11.00
adventures.....
8.90
airport......
3.05
accept..........
11.85
across................
4.20
advertised.....
12.55
aisles........
18.55
acceptable...
15.35
act.......................
3.60
advertisement.
15.80
alarm.........
5.15
acceptance..
16.70
acted...............
5.40
advertising......
11.90
alas............
11.00
accepted......
12.85
acting...............
4.75
advice.............
8.50
alfalfa..........
13.45
accepting.........
15.25
action................
6.30
advisable........
13.65
alike.............
2.85
accident...........
10.95
actions.............
8.00
advise.............
7.45
alive..............
2.65
accidents.........
12.25
active................
6.45
advised...........
8.75
all..................
1.30
accommodate..
18.80
activities...........
15.00
advises...........
10.25
all right.........
14.30
accommodation
19.40
activity...............
13.05
advising..........
9.80
alley.............
9.05
accompanied...
16.30
acts**................
6.50
affair...............
11.45
alligators.....
16.25
*abuse is a heteronym. When it is a noun as in the phrase
child abuse, it is pronounced "uh b'YOO-ss." When it is a verb as in the
phrase "to abuse a privilege," it is pronounced "uh b"YOO-z." All
heteronyms are identified by the use of bolditalics.
** All homophones are identified by bold letters.
Acts is a homophone of ax and axe.