1
Reading Fluency: A Brief History, the Importance of Supporting Processes,
and the Role of Assessment
Dr. David D. Paige
Northern Illinois University
July 30, 2020
While reading fluency has been extensively studied as an independent reading process, it
is better thought of as an outcome of multiple, lower-level reading skills that when functioning in
a synchronous and efficient manner, results in smooth, expressive reading that’s critical to
understanding text. This review begins by defining reading fluency, and then provides a brief
history of how the conceptualization of reading fluency has changed over the past two centuries.
It then discusses the important reading processes that are responsible for fluent reading before
reviewing several studies that emphasize the importance of reading fluency to making meaning
of text. The review concludes with a rationale for why reading fluency, and the foundational
processes that lead to fluent reading, must be regularly assessed in students.
Defining Fluency
Reading fluency has been through multiple conceptualizations. These include the rapid
reading of individual words, reading words correctly, the speed at which one can read connected
text, and reading with expression. Fluent reading is now conceptualized by reading scholars as a
construct composed of three facets, or indicators. These include 1) the rate of one’s reading, 2)
the accuracy at which words are pronounced, and 3) the prosody (meaning expression) in one’s
voice that brings a text to life
1
. While the indicators are individually identified, they work
interactively to produce fluent reading. For example, the rate or pace with which one reads often
simulates, to a loose extent, the pace of spoken language.
Correctly pronouncing individual words is important to
maintaining a smooth rate, otherwise the reader must stop to
analyze and determine how to say the word which breaks the
smoothness of the reading. As in speech, prosody is important
to understanding the various interpretational nuances of the
text, as it is in a conversation. Imagine speaking with someone
who talks in a flat, monotone voice. Much interpretation would be lost and frankly, interest in the
conversation would quickly wane. So while fluency can be defined as three distinct indicators,
they work interactively with each other to produce smooth reading that is both pleasant to listen
to and as with speech, aids understanding.
Fluency has most often been interpreted by researchers as a measurement metric called
words-correct-per-minute (WCPM) or correct-words-per-minute (CWPM) which is calculated as
the total number of words read (reading rate) minus reading miscues (mispronounced words,
words not read, words inserted, and skipped words) over the course of one minute. The problem
with this definition is the exclusion of prosody, the third indicator of reading. To facilitate clear
understanding among the reading community, particularly teachers, the term accumaticity has
Reading fluency is defined by
reading rate, word identification
accuracy, and prosody
(expression).
2
been recently introduced to refer to the measurement metric of words-correct-per-minute
2
while
fluency refers to all three indicators.
Because reading fluency has experienced a variety of interpretations as to its role and
importance in reading that continues to evolve today, a brief overview of how fluency has been
viewed will provide perspective.
A Brief History
Reading instruction in early America emphasized the oral reading of text
4
. Several book
series, such as the McGuffey’s Eclectic Reading Series (1853)
3
, were popular as resources for
learning to read. The following quotation from the fifth edition positions the role of articulation
within fluent reading:
The first step to be taken by one who desires to become a good reader or speaker, is to
acquire a habit of distinct articulation. Without this, the finest voice, the utmost propriety of
inflection, and all the graces of articulation, fail to please. (p. 13).
Articulation, as used in McGuffey’s, refers to the clear accentuation of words by the
reader. Oftentimes, oral reading occurred in public spaces (churches, lecture halls, etc.) without
the aid of amplifying devices, necessitating understandable, fluent reading. The McGuffey’s
reader goes on to mention what would be considered the qualities of reading fluency today a
reading rate that loosely simulated oral conversation, accurate word pronunciation, and the
appropriate use of prosody, all meant to keep listeners engaged in the reading.
By the early twentieth century an increasing number of children were enrolled in formal
education. As reading was now more likely to occur silently, the emphasis on oral reading
declined, although it was still used as a way to assess a
student’s reading progress
4
. About this time the
psychologist Edmund B. Huey (1908)
5
published The
Psychology and Pedagogy of Reading, the first book to
review the science of reading. In the late nineteenth
century psychologists had invented the first machines to
track one’s eyes while reading that provided a gateway
into the cognitive processing of text. Research in this field
led to new insights about reading, some of which resulted
in faulty conclusions (e.g., that all readers read words as a
single “whole”) while others remain basically correct today. These early psychologists
discovered that even good readers do not smoothly move their eyes across the text, but rather,
eyes move both left and right as the reader advances across a sentence.
The middle of the twentieth century brought additional changes to reading instruction. A
prominent textbook on the teaching of reading had been authored by Emmett Betts (1950)
6
, a
professor of reading at Temple University and formerly Pennsylvania State College. Reading
was now conceptualized as a facet of language, an idea that is fundamental to today’s view of
literacy
7
. While Betts acknowledged that most reading occurred silently, oral reading was
perceived as having an important place in the reading program. Critical thinking was encouraged
3
in students as a way to evaluate the author’s message in light of the student’s background
knowledge. Based on insights from a dissertation conducted by Killgallon (1942)
8
, Betts
recommended what is still considered today, the golden rule for instructional text. Although
Killgallon did not construct text complexity guidelines, Betts deemed any text where the student
could not correctly pronounce at least 90% of the words as too difficult to read and to be avoided
(frustration level). Texts were considered instructionally appropriate (to be read in conjunction
with a teacher) if the words were read with 95% accuracy, while texts where word identification
accuracy equaled 99% or better were judged appropriate for independent reading. Shanahan
9
researched Killgallon’s dissertation and found no empirical evidence to support these
recommendations. None the less, these percentages are perhaps the most enduring rules (74 years
running to date) in reading education despite research debunking them
10,11, 12
. The instructional
problem with Betts’ rule is that many teachers are leery of allowing students to read text that is
above their instructional level. Such decisions ignore the power of student interest and
motivation and artificially constrain the scaffolding of text complexity that limits the reader’s
experience with the texts needed to develop college- and career-ready reading skills. Also, at risk
is the reader’s growth of core or global knowledge that is important to comprehension.
Validation of Fluency Interventions
In the late 1970’s and early 80’s, fluent reading as an instructional goal had become
largely ignored. In a seminal article in 1983, Allington
13
noted that while students often lacked
fluent reading, it was rarely addressed with fluency instruction, rather, teachers tended to focus
on improvement of word automaticity. While word automaticity is important to fluent reading,
students must still learn to read words in connected text and
become familiar with syntax that tends to become increasingly
sophisticated as text complexity increases across grades.
To unbundle the interaction between word automaticity
and fluency, Dahl and Samuels
14
conducted a study in 1973 to
improve reading fluency where one group of students practiced
automaticity at the word level while the other engaged in reading fluency practice with
connected text. Students in the fluency development group showed significant improvement
beyond those who worked solely on word automaticity. Two seminal studies, one by Chomsky
15
in 1978 and a second by Samuels
16
in 1983, examined the efficacy of repeated readings to
improve reading fluency. In a repeated reading strategy, students read a short text of 100 to 200
words four times or so over several days. Readings are conducted in the company of a teacher or
more knowledgeable reader to assist with difficult word pronunciations. The two studies
established that practice using repeated readings decreased word mispronunciations and
improved reading rate, resulting in improved reading fluency. Additionally, comprehension
improved as students focused less of their attention on word decoding and more on creating
meaning from the text. The significance of these and other studies is that when sufficient
underlying reading skills are in place, reading fluency can be improved through assisted reading
practice. For example, Lee and Yoon
17
conducted a meta-analysis of 34 studies where repeated
Reading fluency has been largely
neglected.
Richard Allington, 1983
4
reading was used as an instructional strategy for students with reading disabilities. The authors
found that the strategy resulted in significant fluency improvement with a moderate effect size =
0.59, the interpretation of which would equate to a nearly 9-point increase on a standardized test.
In an earlier study, Therrien
18
analyzed 16 studies and computed effect sizes of 0.50 for reading
fluency (moderate) and 0.25 (small) for comprehension. In 2000, the National Reading Panel
19
identified 98 studies that used repeated reading as a method to improve oral reading fluency. The
study found an overall effect size of 0.41 (moderate size), providing the empirical evidence for
the Panel to recommend repeated reading as an effective fluency improvement strategy.
In 1986, Stanovich
20
further raised the profile of reading fluency by showing that the
extent to which a student was a fluent reader was related to the volume of words the student read.
The idea was that students who acquired reading fluency engaged in significantly more reading
that produced efficacious, educational results. Using estimates of
reading volume from Nagy
21
, Stanovich argued that while a struggling
middle school reader may read only 100,000 words in a year, an
average reader is likely to read 10 times that many. The difference in
reading volume leads to large differences in vocabulary exposure and
in the construction of global knowledge, both key to understanding
text
22
. In a study of middle school students by Paige and Smith
23
, the
authors found that reading rate mediates the relationship between
vocabulary and comprehension. The authors found that a reading rate of 127 words-per-minute
differentiated students into low- and high-rate groups with mean reading rates of 104.6 and 156.5
respectively. Students in the low-rate group knew 32% fewer words on a measure of academic
vocabulary and had lower reading comprehension than those with rates exceeding 127.
Unfortunately, disfluent readers are more likely to attribute their poor reading to poor
ability, and are less likely to exhibit the task persistence that leads to improved academic results.
The rationale becomes that since I’m not good at this, why should I put in much effort? In short,
the academic proposition that hard work will result in desirable outcomes becomes increasingly
untenable for many students who struggle with fluent reading.
Oddly, despite the recommendations of the National Reading Panel fluency instruction at
the start of the 21st century had failed to become a staple of classroom instruction across the
country. While the reasons for this are likely several, it is thought among some that poor teacher
knowledge of the nature and role of reading fluency is to blame. Also, and perhaps more
importantly, the emphasis on improving state-wide reading scores has turned the focus of reading
instruction away from the foundational skills that result in fluent reading. In place of the
understanding that reading comprehension stands on the shoulders of fluent reading, instruction
in many schools has focused on raising test scores. Predictably, these efforts have not been
successful as NAEP scores continue to show stagnant to very slow improvement
24
.
The words a student
learns is affected by how
much they read and
hence, their reading
fluency.
5
From Fluency to Comprehension
Whether reading aloud or silently, fluent reading is important as it allows the reader to
focus their mental attention on understanding the text rather than on pronouncing the
words
25,26,27
. Reading theorists have suggested that fluency occurs when the numerous reading
processes work smoothly in a synchronized manner
28,29
. For decades, empirical studies have
shown a moderate correlation between reading
fluency and comprehension, however, several
recent studies suggest a causal
connection
30,31,32,33
. While many of these authors
have found reading rate to be the strongest
predictor of comprehension, research has emerged showing prosody to independently predict
reading comprehension that is either in lieu of, or in addition to, that of rate
34,35,36,37
. While some
evidence exists that reading prosody lags decoding in development
38
, reading prosody appears to
improve comprehension because it allows the reader to imbue text with speech-like
characteristics that increases its understandability. Fluent reading is generally thought to account
for one-quarter to one-half or more of the differences in reading comprehension. For readers who
struggle with fluent reading, about half of the difference is attributable to reading fluency while it
is near one-quarter for those with adequate fluency.
To summarize, fluent reading is dependent on efficient, integrated, lower-level reading
processes including phonemic awareness and knowledge of letter-sound correspondences that
resulst, through practice, in automatic word recognition. When these processes are in place
students have a much greater likelihood of possessing the decoding skills necessary to bootstrap
their word reading that facilitates fluent reading
39
.
Foundational Skills and State Reading Achievement
In 2018 Paige and colleagues
40
published the first study linking foundational skills
(decoding and fluent reading) to reading achievement on standardized, state reading assessments.
The authors gathered measures on 1,064 end-of-third-grade students attending 73 schools in a
metropolitan school district. Students were measured on letter-sound understanding (phonics)
and grade-level reading fluency. These measures were equally weighted and then aggregated into
a reading composite score. Students were then coded as scoring proficient or not on the
composite measure. Results showed that students attaining proficient status on the reading
composite had a 70% chance of scoring proficient or better on the state reading assessment while
those who were less-than-proficient on the composite had a 20% chance of state proficiency.
This study shows clearly that for third-grade students,
attainment of grade-level, foundational reading skills is
critical to attaining state reading proficiency.
A recent study by Wang and colleagues
41
of 10,000,
fifth- to tenth-grade students found that to gain
understanding from text, minimum text decoding skills
must be in place, a finding consistent with the results
Fluency accounts for 25% to over 50% of the
difference in reading comprehension.
70% or 20%?
Students with grade-appropriate
foundational reading skills had a 70%
chance of scoring proficient on the state
reading achievement test while those
without had a 20% chance.
6
from previous authors. However, the authors also found that students not meeting a minimum
decoding threshold experienced comprehension levels that were one-sixth that of students above
the threshold. Additionally, this same condition persisted across all grades meaning students with
poor decoding skills never experienced improved reading comprehension. This study, and that
from Paige et al., highlight the importance of the reading processes necessary for fluent reading,
which we now discuss.
Reading Processes Necessary for Fluent Reading
Phonemic Awareness and Orthographic Mapping
Phonological awareness refers to the ability to hear and manipulate the sounds of
language at the word, syllable, and phoneme level. A phoneme is the smallest speech sound in a
language of which English has 44. While it is not necessary to have phonemic awareness to
acquire speech, it is necessary for learning to connect letters to speech sounds
42,43
. This
fundamental process leads to the eventual learning of thousands of words recognized on sight
that forms the foundation of fluent reading
43
.
Ehri’s orthographic mapping theory
43
explains how students come to instantly recognize
the tens of thousands of words that are critical to reading fluency. The word orthographic simply
refers to the spelling of a word. The orthographic mapping theory hypothesizes that early readers
use their knowledge of the sounds associated with written words and word-parts to anchor word
spellings in memory. While phonemes are associated with speech, an alphabetic language such
as English represents those phonemes using individual letters and letter combinations. Of course,
humans began speaking long before the invention of writing
systems meaning such systems were fitted to represent speech, a
remarkable innovation. While some English letters such as /t/
represent a single phoneme, other letters such as /a/ represent two
(a long or short /a/), while still other phonemes are made with
letter combinations (such as /th/ in the word /the/). Some letter
combinations can represent more than one phoneme depending
on neighboring letters or sometimes even surrounding words (e.g., /ea/ in neat or near). As is
evident from these examples, there often is not a one-to-one correspondence between a letter
name and a phoneme (think of the phonemes in /w/!). Additionally, when young children learn to
speak, they have no need for knowledge of the phonemes within words as they learn to
pronounce the word in its entirety. However, the challenge in learning to decode printed words is
that children must learn to connect the constituent phonemes to letters and their combinations,
what is called sound-to-letter correspondence. In other words, they must develop phonological
analysis skills at the phoneme level. Students without effective phonemic awareness will likely
not possess the necessary analysis skills to adequately decode words and are more likely to
struggle with proficient reading as they progress through school
44,45
. In a study of middle school
students, Paige
46
found that differences in phonemic awareness accounted for moderate to large
decoding and word reading differences in students that were attributable to poor reading fluency
and comprehension.
Words are anchored in long-
term memory by their sounds
(phonemes).
7
In sum, the orthographic mapping theory evolved from much research finding that good
readers do not visually recall words from memory based on their spelling. Rather, they recall the
spelling of words based on the sounds represented by their spelling. If readers did in fact visually
memorize word pronunciations based on spelling, it would require the typical college reader to
have memorized some 50,000 words. Although it is not completely adequate, this reinforces the
need to ensure that young readers develop the requisite phonemic awareness skills necessary for
word learning.
Letter-Sound Understanding
Developing the ability to hear and isolate phonemes within words, while critical, is also
insufficient for fast and accurate word recognition
47
. To become a successful reader, the student
must also gain understanding of the pronunciations of the letter-sound combinations within
words, what is called letter-sound correspondence. For many children, explicit instruction is
necessary to learn the dozens of letter-sound correspondences necessary to unlock word
pronunciations
48,49,50,51
. The seminal work of Read
52
was the first to show that letter-sound
learning unfolds in a predictable manner and is reflected in the way a child connects sounds and
letters to spell words. Later studies identified that sound-to-spelling development takes place
across four letter-features stages based on the learner’s letter, phonemic awareness, and letter-
sound development
53,54,55,56
. While letter-sound understanding is important to reading acquisition
and eventual reading achievement, Bear
57,58
found that a student’s developmental letter-feature
stage is strongly associated with the complexity of text that can be read fluently. This means that
for children with letter-sound understanding that has stalled or is insufficiently developed, the
prospect of becoming a proficient reader is unlikely as the Wang et al.
41
study revealed.
Word Automaticity
Fluent reading is largely dependent on the number of words a student can instantly
pronounce upon sight
59,60,61
. In 1974, LaBerge and Samuels
62
published their seminal theory of
automaticity in reading. A word is considered to be automatic when it can be read while the
reader’s attention is directed to something else. In other words, rather than using one’s mental
attention to purposively decode (pronounce) a word, the word has been learned to the point that
access occurs in a single-step, unitary process on a nearly instant basis (about 25 milliseconds).
Any word that is instantly recognizable by memory is considered a sight-word. The authors
hypothesize that through repeated encounters with a non-automatic word, neurological
connections in the brain strengthen to the point where the word is finally recognized instantly by
the reader.
Logan (1988)
63
on the other hand, conceptualizes automaticity not as a strengthening
process, but as a memory phenomenon. He argues that an
encounter with a word lays down a memory trace in the
brain. Each successive encounter with the word results in
a subsequent trace, each faster than the one before.
Automaticity occurs when the reader can correctly
pronounce the word before they can consciously apply
Students with an inadequate inventory
of words recognized automatically are
unlikely to become fluent readers.
8
decoding strategies. The implication of both theories is that automaticity occurs on a word-by-
word basis. Additionally, it is successful word recognition that unlocks in the reader’s lexical
memory any meaning associated with a word. This is an important implication that should be
noted. Although a reader may know the meaning of a word when used in conversation, the
meaning remains inaccessible if its textual representation cannot be pronounced. Stated more
simply, if the written word is not correctly pronounced its’ meaning remains unknown. A typical
literate individual is likely able to read, spell, and write 50,000 to 70,000 words
21
. Memorizing
the pronunciation of this many written words is an untenable proposition.
Fluency Assessment
Because of its importance to academic success, fluency assessment should take place
across the elementary and middle school grades to be
certain students are attaining the ability to read the
increasingly complex texts necessary for college- and
career-ready reading achievement. As mentioned at the
beginning of this overview, fluent reading reflects the
extent to which a student has acquired the reading
processes that underpin fluent reading. This means, for
example, that an assessment of the reading fluency of a fifth-grade student may determine it to
be less than adequate. While the identification of the student as disfluent is important, it does not
determine why the student is struggling. To get to the root cause, additional assessments
involving phonemic awareness, letter-sound correspondence, and word- and pseudoword reading
are necessary. This brings us to the idea that reading across K-12 reflects growth in reading
processes that occurs across a developmental trajectory. This has important ramifications for
reading assessment and ensuring that the processes critical to fluent reading are in place.
Kindergarten Through Third-Grade
To ensure fluent reading growth, assessment of the following reading processes must take
place: 1) letter naming; 2) phonological/phonemic awareness; 3) letter-sound correspondence; 4)
word reading; and 5) reading fluency.
Letter Naming:
By the middle of kindergarten students must have instant recognition of the 26 letters of
the alphabet in both upper- and lower-case. Letter recognition assessment allows the teacher to
know which letters have been learned and which required additional, focused instruction.
Phonological/Phonemic Awareness:
Students must be able to hear and manipulate syllables, distinguish onsets and rimes, and
recognize and be able to manipulate phonemes. By the end of first-grade, phonemic awareness
skills should enable students to form new words through the identification (isolation) and
replacement of a phoneme to form a new word. At the end of second-grade some students will
have fully developed phonemic awareness skills that have become automatic. An example is
asking what word is made when the /k/ sound at the end of pack is replaced with the /th/ sound?
A student with automatic skills will answer path within 2 seconds. While automaticity of
9
phonemic awareness is rarely assessed, not accounting for its presence can result in false-positive
results showing that a student possesses skills that are in fact, not present.
Letter-Sound Correspondence:
Letter features are acquired in a predictable sequence that is easily assessed using a
developmental spelling approach. Additionally, letter-sound correspondence and phonemic
awareness have been shown to co-develop where growth in one aids the development of the
other. For many children, letter-sound correspondence skills require explicit instruction. Children
also quickly diverge from each other in their acquisition of letter feature knowledge. For a
teacher to be certain that students are showing appropriate growth in this skill, assessment is
critical. Without this knowledge teachers are unable to reliably know how a student is
progressing, and whether or not they require additional, focused instruction.
Word Reading:
As the theory of orthographic mapping suggests, word reading growth is dependent upon
development of phonemic awareness, letter-sound correspondence, and practice reading
connected text. Sight- and pseudo-word reading reveal whether a child is acquiring sight-words
at a sufficient pace and whether or not they are becoming automatic and adequately transferring
letter-feature knowledge to word reading. For example, a developmental spelling assessment
may show the student is adequately progressing, however, a pseudo-word test may suggest less-
than-expected development in light of their decoding knowledge. In this instance the student
should engage in more reading practice with connected text. However, in the absence of a letter-
sound correspondence assessment, a poor pseudo-word reading assessment would suggest the
student is not engaging in sufficient reading practice. However, a developmental spelling
assessment may show that the student is lagging in the critical letter-sound knowledge necessary
for decoding words and does not possess the letter-sound knowledge that is prerequisite for
automatic decoding.
Reading Fluency:
Students should regularly progress in their ability to read increasingly complex text, as
measured by Lexile. As children begin reading connected text in late kindergarten or early first-
grade, regular assessment of fluency should begin no later the middle of first-grade. Because
reading should develop quickly through third-grade, fluency assessment with prosody should
occur three times per year. In the later elementary grades through middle school, fluency should
be assessed twice a year for students who exhibits normal reading development and more
frequently if they are struggling.
In Conclusion
Reading research strongly supports fluent reading as necessary for adequate reading
achievement across the K-12 continuum. A fluent reader is more likely to benefit from both the
vocabulary acquisition that occurs through reading and the growth in global knowledge that is
one of the foundations of reading comprehension. In this article I have made a case that fluent
reading is an outcome of the efficient reading processes that lead to fast acquisition of thousands
of words that are recognized instantly on sight. I have also argued that regular assessment of
10
these processes is necessary until they have become adequately developed in students so as to
support word learning and fluent reading. In order to engage in the volume of reading that is
necessary to build both fluent reading and the global knowledge that undergirds comprehension,
students must be motivated to read. Acquisition of the reading processes that support and then
blossoms into fluent reading is critical in developing students motivated to engage in reading for
pleasure and learning.
11
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