Universal Pre-K: What does it mean and who provides it?

January 6, 2016

Inquiring minds often want to know which states offer “universal pre-K.” As states vary in what they define as universal pre-K (UPK) and in how far they have progressed toward fully implementing a universal program as intended, the answer is somewhat complicated.

Preschool classroomRegarding definition, the term UPK can mean simply that the sole eligibility criterion is age, in contrast to “targeted” programs in which eligibility is limited by child or family characteristics, most commonly income. This need not mean that the program is available to all applicants, as there may be caps on spending or enrollment that limit the number of children who can be served. The other common definition–and what universal means in most other developed countries–is that every child can (and very nearly all do) enroll, just as children in the US do in first grade.

A further complication is that when states launch UPK, they often cannot simply enroll all children who might want to attend immediately. It takes some time to create capacity, and states vary in how quickly they increase enrollment. Perhaps more importantly, states that express the intent to enroll all children all too often lose the political will to do so before they reach that goal, and fail to increase funding to keep enrollment expanding until it serves all who wish to enroll. An added wrinkle is that states often provide funding that incentivizes school districts to offer UPK (directly or through private providers), but they do not require school districts to do so (though districts must accept all who wish to enroll if they do offer UPK). In such a situation, not every location in the state may make pre-K available.

State examples help clarify the variations in definition and intent to implement. At present, only in Vermont; Washington, DC; and Florida can pre-K be considered fully universal, in the sense that every child can enroll and virtually all do, though in Florida, Head Start offers such a superior service that many families choose that over the state’s pre-K program. Oklahoma offers UPK in all but a few districts. West Virginia has been in the process of expansion, but may have reached ‘universal’ in 2015. Enrollment in these states varies from 99 percent, to as low as 70 percent in West Virginia which is still expanding (Barnett, Carolan, Squires, Clarke Brown, & Horowitz, 2015).

Five states–Georgia, Illinois (Preschool for All), Iowa, New York, and Wisconsin have policies that they and others call UPK for 4-year-olds, but which fall short of allowing all children to be served. Wisconsin is the only state with a specific constitutional provision for 4K, and will fund school districts to serve all children but does not require all districts to participate. Although the policy is quite similar to that in Oklahoma, fewer districts participate and enrollment remains considerably lower at 66 percent. In Georgia, enrollment is limited by the amount of funding available year to year, and enrollment has plateaued at about 60 percent. Iowa similarly serves about 60 percent at age 4, but it is less clear why it does not continue to expand. In New York, limited funding restricted enrollment and continues to do so, though New York City’s push to enroll all children led to implementing long-delayed increases in state funding to allow for expansion. Enrollment in New York is expected to reach 50% percent in 2015. Illinois is the most egregious example of the gap between intent or ambition and implementation. Designed to serve all 3- and 4-year-olds, the program has never enrolled even a third of age-eligible children. Illinois prioritizes low-income families for services, and currently serves just 27 percent at age four and 19 percent at age three (Barnett et al., 2014)

Finally, two states have unique policies that could be considered UPK of a sort. In California, Transitional K (TK) serves children who turn five between September 2 and December 2 of the school year. As these children then attend kindergarten the following year, TK is effectively pre-K. TK is available to all children who meet the age cutoff. In New Jersey, a state Supreme Court order mandated universal pre-K in 31 high poverty districts serving about one-quarter of the state’s children. Within these districts the only eligibility criteria are residency and age–enrollment varies by district but ranges from 80 percent to 100 percent.

Considerations regarding access, enrollment, and quality

When evaluating policies, it is also important to understand that UPK programs vary in quality as well as actual enrollment. Schedules, standards, funding, and teaching practices vary widely across the “universal” programs described above. Some require as little as 10 hours per week. Others offer a full school day with before- and after-school care, potentially reaching 10 hours per day. Some leave virtually all policy choices and guidance up to the local school district or program. Florida requires little more than a high school diploma of teachers in school-year programs. Others, like New Jersey, set high standards that every classroom must meet, and provide extensive support and guidance. State funding ranges from $2,200 per child to $15,000 per child. Observations of teaching practices in statewide evaluations indicate that some programs are overwhelming good to excellent, while others are mostly poor to mediocre. States differ in their choices regarding how much to invest in quality versus quantity, though it is clear that there need not be a trade-off if states can muster sufficient political will (Minervino, 2014). Indeed, some have argued that programs that do not reach most of the population may have difficulty obtaining support for adequate quality (Barnett, 2011).

–Steve Barnett and Rebecca Gomez, NIEER

 Barnett, W. S. (2011). Four reasons the United States should offer every child a preschool education.  In E. Zigler, W. Gilliam, & W. S. Barnett (Eds.), The pre-k debates: Current controversies and issues (pp. 34-39). Baltimore: Brookes Publishing.


Checking boxes leads to opening doors

May 27, 2015

I recall sitting at my desk in 2002 as the Early Childhood Programs Coordinator at the Vermont Department of Education, when I first received a survey from a relatively new organization called the National Institute for Early Education Research (NIEER). The survey included multiple questions asking about Vermont’s Early Education Initiative (EEI), a state-funded pre-K program for at-risk children. As much as survey requests would make me groan, I dutifully completed and returned the survey without a second thought. “Perhaps this one might actually amount to something,” was always in the back of my mind.

Percent of 4-year-olds served in state preKLittle did I realize that I would be sitting on the other end of this survey a decade later. Now a member of the research team responsible for the NIEER State of Preschool 2014 Yearbook, I have a new appreciation for the combined contributions of my colleagues at NIEER and especially the state education agency partners who provide the data. I’ll spare you the details involved in collecting, verifying, analyzing, and reporting the data; suffice it to say it’s a laborious process for all parties concerned. But the result is worth the effort–and the sighs of relief echo across the NIEER office once the annual report is released.

That’s not what I want to tell you, though.

Hindsight is a wonderful gift. When I look back to see how early education has evolved both in my former home state and across the nation since filling out the first survey, I am amazed. State-funded pre-K has expanded its reach from 580,000 4-year-olds in NIEER’s first report, to more than 1.3 million in 2013-2014. Not a single state met all 10 of NIEER’s quality standard benchmarks in 2002, now five states and one of Louisiana’s programs clear the bar, and others are close behind. Little Vermont grew beyond most people’s expectations, from a small program serving 1,001 at-risk children in 2002, to a program serving more than 7,200 children, regardless of their situation. Vermont now ranks first among the states for enrollment (behind only DC) serving more than 90 percent at age 4 and 25 percent of 3s. Vermont has placed quality improvement in its sights as well, with support from the federal Preschool Development Grant program. The Green Mountain State is not alone in showing other states what is possible, and momentum continues from New York City to Mississippi, North Dakota, and Hawaii. There will be even more information available in future NIEER Yearbooks.

What does momentum on the national front have to do with the NIEER Yearbook and other research reports? I am convinced pre-K would be a footnote rather than a headline without this research tracking our progress. Filling out those checkboxes has paid enormous dividends. Once relegated to discussions in state agency meeting rooms, pre-K is now on the lips of parents, politicians, scientists, economists, philanthropists, and leaders in military, law enforcement, and business, throughout the nation. The Yearbook has proven to be an indispensable resource for policymakers seeking to capture best practices and policies around the country. The biggest beneficiaries of the Yearbook and all the hard work involved, however, are the many children who can look forward to going to pre-K as a result of these national conversations. They just don’t know how to express it quite yet.

–Jim Squires, Senior Research Fellow


If Everyone Wants Preschool, Why Isn’t It Growing?

October 21, 2014

This entry is cross-posted to The National Journal’s Education Insiders blog in response to the prompt “If Everyone Wants Preschool, Why Isn’t It Growing” from Fawn Johnson:

What catalyst is needed to dramatically grow preschool enrollment? Why has it stalled? What can state and city governments do to increase enrollment? Does it matter what kind of preschool kids enroll in? Should preschool enrollment be required, as K-12 is? Should lower-income households get priority when preschool slots are limited?

As always, Fawn Johnson poses insightful, but difficult, questions. One reason that preschool policy has not advanced more successfully despite overwhelming popular support is that those who oppose it wield considerable clout. Opponents across political leanings often assert that no public money should be used to help the middle class, though research shows that children of all income levels can benefit. Special interests of all stripes prioritize their needs over those of young children generally, and researchers and advocates are forced to set the research record straight.

Also, politicians are adept at giving the appearance of more support than they actually deliver. Very few voters have direct experiences that would help them sort out truth from fiction in this regard.Children with potted plants

Increasing public awareness is the primary reason that NIEER publishes an annual state-by-state review of preschool policy. Even so we encounter considerable difficulty setting the record straight, as politicians seek to confuse the electorate with their own media strategies. They introduce bills supporting preschool that they have no intention of passing. They propose budgets and spending plans that never fully materialize. They authorize expenditures in excess of appropriations and cut budgets mid-year. Final tallies are rarely released with the fanfare that accompanies all of the initial proclamations of support. And, all too many politicians are not above simply misstating the facts.

Finally, the impact of the Great Recession should not be underestimated. More than anything else, it took the wind out of the preschool movement’s sails. The recovery has been slow, but as revenues rise at local, state, and federal levels we can expect to see the growing support for preschool programs manifest in expansions of both enrollment and quality.

– Steve Barnett, NIEER Director


Readiness and Opportunity Gaps in Early Education, 60 Years After Brown v. Board of Ed

May 19, 2014

Saturday marked the 60th anniversary of Brown v. Board of Education, declaring that separate educational facilities are inherently unequal, and marking a major step forward in the Civil Rights movement. Yet 60 years later, equal access to high quality education remains a significant issue, and nowhere more so than in the preschool years.

A new report posted at the Center on Enhancing Early Learning Outcomes (CEELO) describes readiness and opportunity gaps in access to high quality early education, reporting that access to quality “is highly unequal, despite the extent to which public policy at federal and state levels targets disadvantaged children. In part, this is because targeted programs too often are not high quality. Also, targeting is not as effective in reaching disadvantaged populations as policymakers naively assume.”kids learning 3

“Inequality of opportunity for good early education is a particular concern for African American, Hispanic, and non-English-speaking children,” conclude the authors, Milagros Nores and Steve Barnett (NIEER and CEELO). The brief includes a description of readiness gaps at kindergarten, opportunity gaps in early education that may contribute to the kindergarten readiness gap, access to care arrangements for young children, and the impact of state pre-K policy on child outcomes.

NIEER has covered promoting access to quality preschool for Black children in our blog, and in a paper on Equity and Excellence for African American children, and the National Journal recently featured an article on discrimination starting as early as preschool.

In discussing this anniversary, President Obama has no
ted
that “Brown v. Board of Education shifted the legal and moral compass of our Nation,” yet  “the hope and promise of Brown remains unfulfilled” in education. Preschool, especially high quality preschool supported by states, could provide a strong opportunity to begin fulfilling that promise before children even start kindergarten.


2013 State Preschool Yearbook Finds Need for Renewed Investment

May 13, 2014

Today NIEER released its 2013 State Preschool Yearbookat CentroNía/DC Bilingual Public Charter School in D.C. This newest installment of the Yearbook series covers policies, enrollment, and funding for state-funded pre-K programs in the 2012-2013 school year. Joining NIEER Director Steve Barnett at the event were Myrna Peralta, President/CEO of CentroNía; Roberto Rodriguez of the White House Domestic Policy Council; and Rob Dugger of ReadyNation/America’s Edge

Yearbook 2013

Click for the full report.

This year’s report found states still struggling to recover from the economic downturn that did so much damage to preschool programs in the previous year. As Barnett noted, “Our nation has emerged from the recession, but preschool-age children are being left to suffer its effects. A year ago, our data showed a half-billion-dollar cut in funding for state pre-K and stalled enrollment. For 2012-2013, we find that enrollment is down and funding per child, while up slightly, remains stalled at near-historic lows.”

Particularly of concern, the report found that:

  • In 2012-2013, enrollment decreased by about 9,000 4-year-olds from the prior year across the 40 states plus D.C.[1] that offer pre-K. This is the first enrollment decrease nationally NIEER has observed.
  • Slightly more than 1.3 million children attended state-funded pre-K, 1.1 million of them at age 4, accounting for four percent of 3-year-olds and 28 percent of 4-year-olds.
  • On the plus side, 20 states increased enrollment while 11 states reduced enrollment.
  • One program improved against NIEER’s Quality Standards Benchmarks, while two fell back.
  • Also good news, for the first time, every state-funded pre-K program had comprehensive early learning standards. This is first of the quality standards benchmarks to be met by all.
  • Four states, plus one of Louisiana’s three programs, met all 10 benchmarks for state pre-K quality standards, the same as in the previous year. This remains down from the peak of five states in 2010-11. Weak program standards persist in too many states, including lax standards for teacher qualifications in 23 programs and no limits on class size and/or teacher child ratio in a few large states–California, Florida and Texas.
  • Total state funding for pre-K programs increased by $30 million in real dollars, about a 1 percent increase.
  • State pre-K funding per child increased by $36 (inflation-adjusted) from the previous year, to $4,026.
  • Only 15 states could be verified as providing enough per-child funding to meet all 10 benchmarks for quality standards. As only 19 percent of the children enrolled in state-funded pre-K attend those programs, it seems likely that most children served by state pre-K attend programs where funding per child is inadequate to provide a quality education.

Dugger, whose organization supports the business case for early childhood education, put the report’s findings in context to America’s economic future. “The most important product the American economy produces are ready-for-life 18-year-olds,” he said. “The US cannot retain organic growth….unless it invests in its children in the early years.”

NIEER Director Steve Barnett & Roberto Rodriguez of the White House Domestic Policy Council read to children at CentroNía/DC Bilingual Public Charter School .

NIEER Director Steve Barnett & Roberto Rodriguez of the White House Domestic Policy Council read to children at CentroNía/DC Bilingual Public Charter School .

Rodriguez, of the Domestic Policy Council, highlighted federal/state partnership efforts underway, including $250 million for preschool development grants as well as $500 million to build Early Head Start/Child Care partnerships. He called increased investment in early childhood education “one of the most important things we can do as a country,” and called on governors, mayors, philanthropists, and policymakers to work together to prioritize this investment.

The report covers the most recently completed school year, 2012-2013. Trends may be looking up since then. Many states have recently made pre-K a priority in the time since that school year ended, with new initiatives passing in Connecticut, Maine, and Vermont, just this month and a doubling of state pre-K investment in Alabama over the last two years. New York provides a particular model for state-local collaboration, as leaders at all levels of government came together to prioritize early learning. These stories are a cause for optimism, and action: “If ever there were a time for leaders at the local, state, and national levels to unite in their efforts to provide high-quality preschool education to our next generation, this is it,” Barnett said.

Arne Duncan, U.S. Secretary of Education, called for just such participation on a media call discussing the Yearbook. “We just need Congress to catch up and pay attention to what is happening in the real world,” he said. Duncan added:

“Today, nationally, as the NIEER Yearbook shows, fewer than 30 percent of 4-year-olds are enrolled in state-funded preschool programs, and 10 states still do not offer it at all. Sadly, we’re 25th among industrialized countries in enrollment of 4-year-olds in early learning. If we’re going to lead in the global economy, we must do better – in countries like Germany and Japan, more than 95 percent of 4-year olds are enrolled in early childhood education. Quality early education can be a game-changer for the kids who need the most support.  It’s good for them and their families, and for our country’s long-term economic success.  Ultimately, it’s an investment in our collective future.”

The full Yearbook report can be found at here, along with state-specific information pages. Join the conversation on Twitter by tweeting @PreschoolToday and using the hashtag #YB2013.

 

[1] For the sake of comparison, the District of Columbia will be referred to as a “state” throughout this report. Hence, a total of 41 states provide state-funded pre-K.


The Empire State Leads the Way

March 18, 2014

Two of New York’s most distinguished leaders who shared a family name (Roosevelt) were strong advocates for the 99 percent, long before that term was common with their campaigns for the “Square Deal” and the “New Deal.” Today’s leaders are poised to echo their efforts with what might be called the “Real Deal.” A key element of the real deal is to give every child access to a world class 21st Century education, beginning with high quality pre-K for all.  New York State has been promising universal preschool to its children for 20 years. With leadership from the NYC Mayor, the Governor, and Legislators in the Senate and Assembly they are finally moving to fulfill that promise–a victory for New York’s young learners and the middle class. Last week, the State Senate proposed supporting free full-day prekindergarten and after-school programs in New York City with $540 million per year in state funds over 5 years.  The Assembly has already endorsed Mayor de Blasio’s plan for expansion with a pre-K and after-school tax on NYC’s wealthiest.

The next step is for leaders to come together behind a single plan to move forward, with a firm commitment to financing and a timeline for delivering on this promise. Recent statements indicate that New York’s leaders are prepared to put partisanship and personal ambition aside to do right by the state’s children.  The Assembly and Mayor have indicated they can accept the Senate plan. The Governor has repeatedly said he supports fully funding pre-K and should join them and make this plan a reality. If he does so, he will have propelled the preschool-for-all movement to a major turning point, not just in New York, but in the nation.  New York is the third most populous state.  If it were an independent country it would have the world’s 16th largest economy. With high-quality public education beginning at age four for all, New York will become a model for other states and even countries beyond our borders.

As we reported in our 2012 State of Preschool Yearbook, New York State has some way to go to achieve this goal of national and international leadership in early education.  It currently serves about 44 percent of its 4-year-olds, ranking ninth in the nation for enrollment, but funding per child has not kept pace with program expansion, jeopardizing quality.
NY state enrollment
NY state spending

Providing adequate funding and a timeline for implementation is a major step toward the real deal in pre-K, but political leaders must also support the hard work needed to successfully implement this plan and deliver the promise.  This will require a relentless focus on quality, and a shift from campaigning to governing that will provide pre-K programs with the support and accountability required to achieve and maintain excellence in every pre-K classroom.  At this stage it is important to ensure that state and local agencies have the resources to guide this continuous improvement process, as in other states where pre-K has produced the promised results (Michigan, North Carolina, and New Jersey, to name a few).

When well implemented, pre-K is a valuable and important long-term investment.  At NIEER we estimate that by offering all children quality pre-K, New York will actually realize a net reduction of more than $1 billion in its education budget by 2030. This figure includes cost-savings as a result of reducing special education placement and grade retention.  It does not include other long-term benefits from improving the education of New York’s children–increased productivity and economic growth and better health outcomes, among them.

New York isn’t alone in the pre-K push. Even states that have not historically supported pre-K are getting in on the investment, including: a small program in Hawaii; a pilot program in Indiana; and a new program legislated in Mississippi.  Yet, New York’s UPK initiative, if done well, could become the nation’s leading example of good early education policy because of its proposed quality and scale.  It’s time for every New Yorker to get behind this initiative and work with the Governor, Mayor, and legislative leaders of both parties, to carry through on New York’s 20-year-old promise.

– Steve Barnett, Director

Megan Carolan, Policy Research Coordinator

Kirsty Clarke Brown, Policy and Communications Advisor


Why preschool critics are wrong

February 28, 2014

In a recent blog on his Brookings Institution site, Grover Whitehurst claims that the preponderance of scientific evidence does not indicate lasting positive benefits from preschool.  Others disagree, he says, because they are not as “picky” about the evidence. As there is no disputing taste, I assume he means that the research he prefers is more rigorous and relevant, not just better aligned with his personal preferences.  Hence, we would be looking for a valid and reliable process when he arrays the research and grades each study.  In fact, his list of studies and his analyses are appallingly inaccurate for someone who claims to be an expert.  As shown in detail below, Whitehurst omits much of the relevant research, and he misrepresents the studies that he includes. Steven Barnett

Whitehurst claims that “Not one of the studies that has suggested long-term positive impacts of center-based early childhood programs has been based on a well-implemented and appropriately analyzed randomized trial.”   This claim is false based even on the studies he does cite.  His own statements in the blog regarding the Perry Preschool study and its re-analyses by Jim Heckman contradict this claim, as do older analyses demonstrating that minor departures from random assignment in the Perry study had no substantive effects on the results.[1] No study is perfect, so it is seems odd that Perry receives an A- for an inconsequential fault when other less than perfect studies get an A. Then there is the Infant Health and Development program (IHDP) study, which Whitehurst assigns higher grades than Perry, but which he seems to forget when making his “not one” study claim.

Yet Whitehurst’s credibility problem is far more serious when one turns to the studies that are missing from his analysis.

In fact, a number of other well-implemented and appropriately analyzed randomized trials find lasting effects from preschool education.  For example, a study of long-term effects conducted by the Institute for Developmental Studies (IDS) included 402 children randomly assigned to a public school pre-K program or to a control group at age 4 for one year.[2]  A teacher and an aide staffed each preschool classroom of 17 children. Positive effects were found through at least third grade.  Even longer term follow-up indicates adult gains in achievement, educational attainment, and employment, but suffers from severe attrition. So while we can have strong confidence in the results through third grade, we have less confidence in the very long-term results.  However, the findings for adults are consistent with the earlier results in the elementary grades and with findings in Perry and other studies.  Another randomized trial of preschool education is noteworthy because it was conducted with relatively advantaged children, and it also found evidence of lasting effects on achievement into the early elementary grades.[3]

Inexplicably, Whitehurst fails to recognize a large number of studies (once again including well-implemented randomized trials) that compare one form of preschool education to another to study the effects of curriculum, length of day, and other features.  When such studies find lasting differences due to the type of preschool program, from the end of kindergarten to the end of high school, they add to the evidence that high-quality preschool education per se has long-term effects.  This literature includes studies (herehere, and here) over many years, some begun decades ago with very long-term follow-ups and some very recent with much shorter follow-ups.[4]  These studies also add to the evidence for successful scale up in large-scale public programs.

As preschool research is conducted in other countries, not just the United States, there is a broad range of research Whitehurst omits that finds lasting benefits from quality preschool education, including rigorous studies in countries with universal programs and additional well-implemented, appropriately analyzed randomized trials.[5]  When similar outcomes from quality pre-K are found with different populations in different contexts, such studies are confirmatory—not irrelevant.  Taken together, they indicate that the relationships between quality preschool education and long-term outcomes are quite robust with respect to variations in the children and families served.

Returning to the matter of how Whitehurst represents the few studies he prefers to include, the ongoing Tennessee evaluation of pre-K effectiveness is one of only two to receive double A grades.  He calls this study a well-implemented and analyzed Random Control Trial (RCT) and reports that it finds no differences later in elementary school.

This description of the Tennessee study and its findings is shockingly inaccurate.

The Tennessee pre-K evaluation includes both a large randomized trial of pre-K that follows children using the data routinely collected by schools, and a smaller intensive substudy (ISS) in which randomization failed.  The results Whitehurst cites come from that substudy, which is not analyzed as a randomized trial.  Let me quote directly from the study authors: “The nonconsent rates for the two cohorts in the ISS sample mean that we do not have data on the main ISS outcomes for many of the children who were initially randomized, so analysis on the basis of that randomization is not possible.”[6]  To be perfectly clear, because so many fewer parents in the control group agreed to have their children tested in the substudy, randomization was not used to analyze the data.  Instead, the substudy used a quasi-experimental approach of the type that Whitehurst otherwise gives lower grades.

Yet it is not just the Tennessee study’s methods that are misrepresented, but also its results.  While the full randomized trial will not provide test score results until children reach the state’s third grade tests, it does provide results for grade retention.  Let me again quote the study’s authors directly:

For the Intensive Substudy sample, there was a statistically significant difference between the 4.1% of the TN‐VPK participants who were retained in kindergarten compared to the 6.2% retention rate for the nonparticipants. This effect was confirmed in Cohort 1 of the full randomized sample, with retention data still unavailable for Cohort 2 of that sample. In Cohort 1, 4.0% of the TN‐VPK participants were retained in kindergarten compared to 8.0% of the nonparticipants, also a statistically significant difference.[7]

In other words, analyses of both the compromised Tennessee substudy and the full randomized trial find that the pre-K program significantly reduced grade retention in kindergarten.  The only finding from this adequately randomized part of the Tennessee study is this persistent positive effect, and this effect is twice as large as that found in the quasi-experimental substudy (which still finds a significant positive effect of pre-K).  Yet, Whitehurst reported the study found “no differences later.”

I could go on to list additional problems with Whitehurst’s review, but surely these suffice to demonstrate that his summary of the evidence is just plain wrong–not picky.

– W. Steven Barnett, Director, NIEER and CEELO

This entry originally appeared in Valerie Strauss’ education blog “The Answer Sheet” at the Washington Post.

[1] Weikart, D.P., Bond, J.T., & McNeil, J.T. (1978). The Ypsilanti Perry Preschool Project: Preschool years and longitudinal results through fourth grade. Ypsilanti, MI: HighScope. Barnett, W.S. (1996). Lives in the balance: Age 27 benefit-cost analysis of the High/Scope Perry Preschool Program. Ypsilanti, MI: HighScope.

[2] Deutsch, M., Taleporos, E., & Victor, J. (1974). A brief synopsis of an initial enrichment program in early childhood. In S. Ryan (Ed.), A report on longitudinal evaluations of preschool programs Volume 1: Longitudinal evaluations (pp. 49-60). Washington, DC: Office of Child Development, US Department of Health, Education, and Welfare. Deutsch, M. , Deutsch, C. P. , Jordan, T. J. , & Grallo, R. (1983). The IDS program: An experiment in early and sustained enrichment. In Consortium for Longitudinal Studies (Ed. ). As the Twig is Bent: Lasting Effects of Preschool Programs(pp. 377-410). Hillsdale, NJ: Lawrence Erlbaum. Jordan, T. J. , Grallo, R. , Deutsch, M. , & Deutsch, C. P. (1985). Long-term effects of early enrichment: A 20-year perspective on persistence and change. American Journal of Community Psychology13(4), 393-415.

[3] Larsen, J. M. , & Robinson, C. C. (1989). Later effects of preschool on low-risk children. Early Childhood Research Quarterly4, 133-144.

[4] Schweinhart, L. J. & Weikart, D. P. (1996). Lasting differences: The High/Scope Preschool Curriculum Comparison Study through age 23. Ypsilanti, M: High/Scope. Chambers, B. , Cheung, A. , Slavin, R. E. , Smith, D. , & Laurenzano, M. (2010). Effective early childhood education programmes: a best-evidence synthesis. Reading, England: CfBT Education Trust. Robin, K. B. , Frede, E. C. , & Barnett, W. S. (2006). Is More Better? The Effects of Full-Day vs Half-Day Preschool on Early School Achievement. New Brunwick, NJ: National Institute for Early Education Research. Preschool Curriculum Evaluation Research Consortium (2008). Effects of Preschool Curriculum Programs on School Readiness (NCER 2008-2009). Washington, DC: National Center for Education Research, Institute of Education Sciences, U. S. Department of Education. Washington, DC: U. S. Government Printing Office. Clements, D. H. , & Sarama, J. (2011). Early childhood mathematics intervention. Science333 (6045), 968-970.

[5] Ruhm, C. J. , & Waldfogel, J. (2012). Long term effect of early childcare and education. Nordic Economic Policy Review. Economics of Education, 23-51. Apps, P. , Mendolia, S. , & Walker, I. (2013). The impact of pre-school on adolescents’ outcomes: Evidence from a recent English cohort. Economics of Education Review37, 183-199.

Raine, A. , Mellingen, K. , Liu, J. , Venables, P. , & Mednick, S. A. (2003). Effects of environmental enrichment at ages 3–5 years on schizotypal personality and antisocial behavior at ages 17 and 23 years. American journal of psychiatry160(9), 1627-1635.

[6] Lipsey, M. W. , Hofer, K. G. , Dong, N. , Farran, D. C. , & Bilbrey, C. (2013). Evaluation of the Tennessee voluntary prekindergarten program: Kindergarten and first grade follow-up results from the randomized control design (pp. 22-23). Nashville, TN: Vanderbilt Peabody College.

[7] Lipsey, M. W., Hofer, K. G., Dong, N., Farran, D. C., & Bilbrey, C. (2013). Evaluation of the Tennessee voluntary prekindergarten program: Kindergarten and first grade follow-up results from the randomized control design (p. 50). Nashville, TN: Vanderbilt Peabody College.


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