Child Reading Literacy and the Role of Public Libraries: A Review of Secondary Sources

Abstract

In February 2026, Mathematica delivered to the Institute of Museum and Library Services a systematic review of how public libraries engage children in reading—drawing on 84 peer-reviewed manuscripts, 14 landscape documents, 50 IMLS-funded grants across 24 states, and interviews with program officers. The study addresses seven research questions spanning developmental definitions of reading engagement, library best practices, caregiver-child interactions with library resources, digital transformation, ecosystem roles, infrastructure variation, and methodological gaps. Using a 0–37 point scoring rubric applied to 336 screened manuscripts, the authors surface a field marked by conceptual fragmentation, practitioner innovation outpacing empirical validation, and persistent measurement challenges. For researchers, the work provides a synthesis framework organized around home literacy environment, public library context, developmental stage, and general attitudes. For funders and library professionals, it offers both a taxonomy of current investments—staff training leads at 32 percent of grants, followed by summer reading and expanded collections—and a candid accounting of what remains unknown about effectiveness, dosage, and equity. This review stands as the most comprehensive mapping to date of the empirical and programmatic landscape at the intersection of public libraries and child literacy.

1. Why This Study Matters

Public libraries in the United States occupy a unique position in the literacy ecosystem: they are neither schools nor homes, yet they touch nearly every community and serve families across the socioeconomic spectrum. The Institute of Museum and Library Services invests tens of millions of dollars annually in library-led literacy initiatives, from discretionary grants to formula allocations distributed through state library agencies. Until now, no single synthesis has systematically examined what is known—and what remains uncertain—about how libraries contribute to children's reading development from birth through age twelve.

Mathematica's review arrives at a moment of transition. Digital resources have proliferated in library collections. The COVID-19 pandemic disrupted in-person programming and accelerated online service models. Meanwhile, national partnerships such as the Campaign for Grade-Level Reading position libraries as anchor institutions in community-wide literacy efforts. Yet the evidence base supporting specific library practices has developed unevenly, and program officers lack comprehensive guidance on which interventions merit scaling and which warrant further investigation.

The study builds on a 2023 IMLS-sponsored literature review by Guven and Haddad and incorporates insights from the March 2022 convening "Empowering Citizens, Empowering Readers" held in Washington, DC. By triangulating peer-reviewed research, gray literature, and grant implementation data, Mathematica provides a foundation for evidence-informed decision-making by library administrators, researchers designing evaluations, and federal program staff allocating resources.

2. What the Study Did

Three Integrated Data Sources

Mathematica structured the inquiry around three complementary streams of evidence, each designed to answer different facets of the seven research questions.

Literature Review: From 336 to 84

The research team began with 336 manuscripts published between 2013 and 2024. Screeners applied a 37-point scoring rubric evaluating relevance, methodological rigor, and alignment with the research questions. This process yielded 98 prioritized manuscripts; after eliminating 14 that did not meet final inclusion criteria, 84 manuscripts formed the evidence base. The scoring range of 0 to 37 allowed granular differentiation among studies of varying quality and focus.

Coverage across the seven research questions proved uneven. Ninety-three percent of manuscripts addressed RQ5 (libraries' role in the literacy ecosystem), and 74 percent touched on RQ2 (library best practices and infrastructure investments). In contrast, only 24 percent of manuscripts examined RQ4 (changes in engagement following the introduction of digital resources), signaling a significant gap in the empirical record.

Landscape Review: Documents and Interviews

To capture practitioner knowledge and gray literature, the team analyzed 14 documents and conducted three interviews with IMLS staff. These sources addressed six of the seven research questions, offering context on program design, implementation challenges, and emerging priorities that peer-reviewed literature had not yet assimilated.

Grant Analysis: 50 Projects Across 24 States

The grant analysis traced two distinct funding streams. For discretionary grants, Mathematica started with approximately 9,000 applications, filtered to 1,000 targeting children from birth to age twelve, applied keyword searches for "literacy" and "reading" to narrow the pool to 175, and selected 18 grants awarded between fiscal years 2020 and 2023. For Grants-to-States projects, the team began with roughly 10,000 activities reported by state library agencies, identified 5,000 discrete projects, applied similar filters to reach 55 candidates, and finalized 32 projects from fiscal years 2020 through 2022. In total, 50 grants spanning 24 states provided a window into how federal dollars translate into local programming.

The analysis coded each grant for the types of activities it supported. Because grants often funded multiple activities, percentages exceeded 100 when summed. Thirty-two percent of grants included training for library staff. Twenty-six percent supported summer reading programs. Twenty-two percent expanded physical or digital collections. Twenty percent developed resources for caregivers. Eighteen percent focused explicitly on literacy skill development, and an equal share funded storytime programming. Smaller proportions addressed literacy packets (8 percent) and other infrastructure investments (6 percent).

3. What the Study Found

RQ1: Defining and Measuring Reading Engagement

Sixty-three percent of manuscripts addressed how reading engagement is defined and measured across developmental stages. Mathematica synthesized these definitions into a four-quadrant construct presented in Exhibit IV.1 of the report:

• Home literacy environment: Frequency and quality of caregiver-child shared reading, the presence of shared reading routines, caregiver attitudes, the number and variety of books at home, and caregiver involvement in developmental activities.
• Public library context: Library utilization (attendance and membership), knowledge of services, and perceived importance of the library.
• Developmental stage: For children birth to age five, measures include language development, emergent literacy skills, and expressive and receptive vocabulary. For ages six through twelve, oral comprehension and reading comprehension become salient.
• General context: Reading for pleasure, attitudes toward reading, motivation, confidence in reading skills, and perceptions of peers' reading habits.

The authors note that this multidimensional framework reflects the complexity of literacy development but also highlights the absence of consensus measures. Grant recipients employed proxies such as program participation counts, circulation statistics, new library card registrations, children's stated intentions to return, and caregiver perceptions of reading readiness—metrics that capture engagement breadth but not necessarily depth or skill acquisition.

RQ2: Library Best Practices and Infrastructure Investments

Seventy-four percent of manuscripts examined activities and infrastructure that libraries consider best practices. The grant data provided concrete illustrations. Training library staff was the most common investment category, appearing in nearly one-third of sampled grants. Examples include Arizona's "Building a New Generation of Readers," which enabled librarians to complete an early childhood literacy certificate, and Alaska's "Raven Reads at the Library Toolkit," which trained staff to deliver a specific curriculum.

Summer reading programs, present in 26 percent of grants, reflected libraries' role in mitigating summer learning loss. California's "Summer @ Your Library" leveraged an existing state book club infrastructure to curate titles and authors. Rhode Island's "Kids Read Across Rhode Island" went further, providing resource guides to teachers so summer reading materials could be integrated into classroom lessons during the academic year.

Expansion of collections (22 percent of grants) and resources for caregivers (20 percent) underscored libraries' dual function as resource hubs and sites of caregiver education. The "Every Child Ready to Read" framework, grounded in five practices—Talking, Singing, Reading, Writing, Playing—and the principle that parents are a child's first and best teacher, informed many caregiver-facing initiatives. Colorado's "Growing Readers Together" provided caregivers with information on literacy-related developmental milestones. Georgia's "Take 5 Early Literacy Family Engagement Initiative" administered surveys to assess caregiver perceptions of children's readiness.

Infrastructure investments extended beyond staff and collections. Washington's Stillaguamish Library Program invested in age-appropriate, adaptable furniture for its early learning center. Pennsylvania's Library System of Lancaster County deployed a bookmobile to bring resources directly into communities. These examples illustrate the heterogeneity of infrastructure needs and solutions.

RQ3: How Children and Caregivers Engage with Library Resources

Sixty-six percent of manuscripts explored patterns of engagement, both individual child use and joint caregiver-child participation. The grant analysis revealed programming designed to strengthen both modes. Storytime—funded by 18 percent of grants—serves as a cornerstone activity. Louisiana's Early Literacy grant distributed literacy packets containing reading materials and activity guides for home use, extending the library's reach beyond its physical walls.

Massachusetts' "Strength in Families" program exemplifies developmental tailoring: songs and storytimes for infants, music and movement for toddlers, play groups for preschoolers. The multi-state "Prime Time Family Reading" initiative brought elementary-age children and their caregivers together for storytime followed by discussions led by humanities researchers, modeling high-quality shared reading interactions. The Oneida Nation Library Enhancement Project innovated by engaging families in storytime while walking trails around the library grounds, integrating literacy with physical activity and cultural connection.

Despite programmatic diversity, the literature review revealed limited evidence on how specific features of library visits—duration, frequency, types of materials selected—correlate with literacy outcomes. Alaska's "Raven Reads" program measured time caregivers spent reading with children outside the library, an effort to trace program influence into the home, but such linkage studies remain rare.

RQ4: The Digital Transformation

Only 24 percent of manuscripts addressed how children's reading engagement has changed with the introduction of digital and online resources. This represents the thinnest coverage among the seven research questions. The scarcity suggests either that digital integration is too recent for longitudinal studies to have matured, that researchers have not prioritized this question, or that rapid technological change outpaces publication cycles.

Mathematica notes this gap without speculation, but the grant data hint at activity on the ground: 22 percent of grants expanded collections, a category that includes e-books, audiobooks, and digital databases. The mismatch between practitioner investment and empirical literature underscores the need for evaluations that isolate the effects of digital versus physical materials on engagement and skill development.

RQ5: Libraries in the Literacy Ecosystem

Ninety-three percent of manuscripts touched on the literacy ecosystem, making this the most thoroughly documented research question. Mathematica distills library roles into three categories, presented in Box IV.8 of the report:

Resource hub: Libraries house books, multimedia materials, and physical spaces that children use to support reading engagement.

Direct service provider: Libraries sponsor programs such as summer reading and after-school tutoring that directly engage children, often supplementing formal school-based learning.

Convener of community organizations: Libraries collaborate with or provide resources to schools, pediatricians' offices, and other entities that support children's reading development.

The ecosystem framing situates libraries neither as replacements for schools nor as standalone interventions, but as nodes in a network. The Campaign for Grade-Level Reading, identified as an anchor literacy partner for IMLS, exemplifies cross-sector collaboration. Tools such as the Benchmarks Curricular Planning and Assessment Framework offer libraries structured approaches to measure their contributions within this broader system.

Yet the literature also reveals fragmentation. Ecosystem-level evaluations that track how library engagement interacts with school instruction, home practices, and community resources are scarce. Most studies examine libraries in isolation, limiting understanding of cumulative and interactive effects.

RQ6: Variation by Infrastructure and Community Characteristics

The review found limited empirical evidence on whether engagement patterns differ by library infrastructure (size, staffing, budget) or community characteristics (rurality, socioeconomic composition, linguistic diversity). Grant descriptions hint at variation—rural bookmobile services versus urban learning centers, tribal libraries integrating cultural practices—but manuscripts rarely stratify findings by these dimensions. This gap constrains the field's ability to identify which models work where and for whom.

RQ7: Methodological Considerations for Future Research

Rather than a findings section, RQ7 functions as a synthesis of methodological challenges surfaced by the review itself. The authors identify several:

• Outcome measurement inconsistency: Libraries use diverse proxies for engagement, from circulation counts to survey self-reports, complicating cross-study comparison.
• Attribution challenges: Isolating library effects from concurrent school, home, and community influences requires designs—such as randomized trials or quasi-experimental approaches—that are resource-intensive and rare in the library context.
• Dosage ambiguity: Few studies specify the intensity, duration, or fidelity of library programming, making it difficult to assess whether null findings reflect ineffective interventions or insufficient exposure.
• Longitudinal gaps: Most studies are cross-sectional. Long-term tracking of children's literacy trajectories as a function of library engagement is nearly absent.
• Equity dimensions underexplored: While grants target underserved populations, manuscripts seldom disaggregate outcomes by race, ethnicity, language, or disability status.

Mathematica does not propose solutions but frames these as frontier questions for the field.

4. Methodological Observations

Strengths

The study's triangulation of peer-reviewed literature, landscape documents, and grant data provides unusual breadth. By coding grants using the same conceptual framework that organized the literature review, Mathematica enables direct comparison between what researchers study and what practitioners do. The 37-point scoring rubric for manuscripts introduced a level of methodological triage uncommon in narrative reviews, allowing readers to understand which findings rest on robust evidence and which on emerging or exploratory work.

The inclusion of IMLS staff interviews adds institutional memory and programmatic context that published literature often lacks. The temporal scope—manuscripts from 2013 to 2024, grants from fiscal years 2020 through 2023—captures a decade of evolution while remaining recent enough to inform current decision-making.

Acknowledged Limitations

Mathematica notes several constraints. The literature review, though systematic, reflects publication bias: studies with null or negative findings are underrepresented. The grant analysis, drawn from a subset of IMLS-funded projects, cannot represent the full universe of library literacy programming, much of which occurs without federal support or formal evaluation.

The 24-state sample, while geographically diverse, skews toward states with capacity to apply for competitive grants, potentially underrepresenting libraries in under-resourced areas. The keyword-based filtering process for grants ("literacy," "reading") may have excluded relevant projects described using alternative terminology ("language development," "early learning").

The authors explicitly state that the review synthesizes existing knowledge but does not generate new empirical findings. It describes what libraries do and what research has examined; it does not assess whether those activities achieve intended literacy outcomes. That causal question remains largely unanswered in the literature the review summarizes.

5. Open Research Questions the Study Identifies

Mathematica's synthesis surfaces more unknowns than certainties, a reflection of a field in mid-development. The following questions emerge as priorities:

• What is the effective dosage of library programming? How many storytime sessions, at what frequency, produce measurable gains in emergent literacy? Do effects plateau, or do they scale linearly with exposure?
• How do digital resources alter engagement and learning? The 24 percent manuscript coverage of RQ4 leaves foundational questions unanswered: Do children who access e-books develop comprehension skills differently than those who read print? Does screen-based reading in the library context differ from school or home screen use?
• What explains variation in library effectiveness across communities? Are smaller rural libraries with limited staff less able to deliver high-quality programming, or do they offer advantages in personalization and community integration? How do libraries serving linguistically diverse populations adapt, and with what results?
• How do library and school efforts interact? When a child participates in both a school reading intervention and a library summer program, are effects additive, synergistic, or redundant?
• What role do caregivers play as mediators? Frameworks like Every Child Ready to Read assume caregiver education translates into home practice changes that benefit children. How often does this chain hold? Where does it break?
• What are the long-term outcomes of early library engagement? Does a child who attends storytime at age three read more fluently at age eight? Does adolescent library use correlate with elementary library exposure?
• How equitable is access and benefit? Do children from historically marginalized communities engage with libraries at similar rates? When they do, do they derive comparable literacy gains, or do structural barriers attenuate effects?

These are not rhetorical questions. They represent tractable empirical problems for which the field lacks data.

6. Implications for the Field

For Library Practitioners and Administrators

The grant analysis confirms that investment priorities have converged around a set of core activities: staff training, summer reading, collection expansion, caregiver resources, and storytime. This convergence likely reflects both practitioner consensus on what matters and the influence of frameworks like Every Child Ready to Read. Yet the literature review reveals that evidence of effectiveness for most of these activities remains thin or context-dependent.

Practitioners should not interpret this as a call to abandon current practices. Rather, it underscores the importance of local evaluation. Libraries implementing programs like Prime Time Family Reading or literacy packet distribution should build in data collection—pre-post assessments of child skills, caregiver surveys, circulation tracking—that can contribute to the evidence base. Partnerships with university researchers or evaluation consultants can make such data collection feasible even for smaller systems.

The infrastructure findings highlight the diversity of capital needs. Bookmobiles, furniture, and digital platforms all appear as funded investments, suggesting that IMLS and state agencies recognize that "infrastructure" cannot be reduced to a single formula. Libraries seeking grants should tailor proposals to their community's specific access barriers, whether geographic, developmental, or technological.

For Researchers

Mathematica's synthesis identifies RQ4 (digital transformation) and RQ6 (variation by infrastructure and community) as particularly underexplored. Researchers designing studies have a clear mandate: these gaps warrant prioritization. Mixed-methods designs that combine quantitative outcome measurement with qualitative process documentation could illuminate how context shapes program implementation and effectiveness.

The 37-point scoring rubric implicitly sets a methodological bar. Studies that lack comparison groups, rely solely on self-report, or measure only participation rather than learning outcomes scored lower. Future research should incorporate control or comparison conditions, validated literacy assessments, and attention to dosage and fidelity.

Longitudinal designs remain rare and expensive, but they are essential for understanding whether early library engagement has lasting effects. Even simple cohort tracking—following a group of children who participated in a library program and a matched group who did not—could advance the field significantly.

For Funders and Policymakers

The Institute of Museum and Library Services and state library agencies face a tension: practitioners need funding now, yet the evidence base for many interventions is incomplete. Mathematica's review suggests a portfolio approach. Continue supporting proven activities like summer reading and storytime, which have strong theoretical grounding and practitioner endorsement. Simultaneously, allocate a portion of funding to experimental or quasi-experimental evaluations that test specific program features—session length, caregiver involvement, digital versus print materials—under controlled conditions.

The ecosystem framing in RQ5 has policy implications. If libraries function best as conveners and resource hubs within a broader network, then funding structures should reward cross-sector partnerships. Grants that require collaboration with schools, pediatricians, or early childhood centers may produce stronger outcomes than those directed at libraries in isolation. Metrics should capture not only direct service delivery but also the strength and reach of collaborative networks.

The equity gaps identified in RQ6 and RQ7 suggest that aggregate national data may obscure disparities. Funders should require grantees to report disaggregated participation and outcome data by race, ethnicity, language, and socioeconomic status. Where disparities emerge, targeted supports—additional staff training, culturally responsive materials, translation services—should follow.

Cross-Cutting Themes

Several themes cut across the findings. First, measurement matters. The field's reliance on proxy indicators—program attendance, circulation—likely underestimates true impact when those proxies are weak, and overestimates it when participation is high but learning is shallow. Investment in shared measurement tools, akin to the Benchmarks framework mentioned in the report, could enable cross-library learning.

Second, the home-library boundary is porous. Many effective practices—literacy packets, caregiver education, take-home materials—aim to extend library influence into the home. This complicates attribution but also multiplies potential impact. Research and practice should attend to this continuum rather than treating library and home as discrete settings.

Third, professionalization is underway. Thirty-two percent of grants funded staff training, signaling recognition that librarians need specialized skills to support early literacy. Credential programs, continuing education, and communities of practice can sustain this professionalization, but they require stable funding and institutional commitment.

Citation

Lugo-Gil, Julieta, Jennifer Walzer, Walter Herring, and Lizabeth Malone. Child Reading Literacy and the Role of Public Libraries: A Review of Secondary Sources. Mathematica, prepared for the Institute of Museum and Library Services. February 2026. Available at: https://www.imls.gov/sites/default/files/2026-03/LibraryChildLiteracySecondaryResearch.pdf.

Disclaimer: This publication is authored by Mathematica. The views expressed in this publication do not necessarily reflect the views or policies of the Institute of Museum and Library Services or the U.S. Government.