{"id":1415,"date":"2026-08-30T22:53:56","date_gmt":"2026-08-30T12:53:56","guid":{"rendered":"https:\/\/childrensvoicesconference.csu.domains\/2026\/?p=1415"},"modified":"2026-08-30T22:53:56","modified_gmt":"2026-08-30T12:53:56","slug":"cvc2026-712","status":"publish","type":"post","link":"https:\/\/childrensvoicesconference.csu.domains\/2026\/cvc2026-712\/","title":{"rendered":"CVC2026-712 \u2013 Does this intervention work? Fidelity measurement in a preschool-based vocabulary intervention"},"content":{"rendered":"<div class=\"cvc-hero alignfull\">\n  <span class=\"cvc-chip\">Presentation \u2013 CVC2026-712<\/span>\n<\/div>\n<h1 class=\"wp-block-heading has-text-align-left\">Does this intervention work? Fidelity measurement in a preschool-based vocabulary intervention<\/h1>\n<p class=\"wp-block-paragraph\">\n<div class=\"cvc-authors\">\n<p><strong>Halla J\u00f3nsd\u00f3ttir,<\/strong> University of Iceland, Iceland<\/p>\n<p><strong>Kathryn Crowe, <\/strong>University of Iceland, Iceland<\/p>\n<p><strong>Susan Neuman,<\/strong> New York University, Steinhardt School of Culture, Education, and Human Development, United States<\/p>\n<p><strong>Bj\u00f6rg Einarsd\u00f3ttir,<\/strong> Kjarkur Rehabilitation Centre, Iceland<\/p>\n<\/div>\n<p class=\"wp-block-paragraph\">\n<div class=\"ast-oembed-container \" style=\"height: 100%;\"><iframe title=\"CVC2026-712 Does this intervention work? Fidelity measurement in a preschool-based vocabulary interv\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/BEgmynVOrHU?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div>\n<\/p>\n<p class=\"wp-block-paragraph\">\n<p><strong>Background: <\/strong>Fidelity refers to whether an intervention is delivered as intended. Without understanding fidelity, we can\u2019t know whether an intervention truly works. This requires careful measurement of how an intervention is delivered, which is challenging when studies are conducted in real-world settings.<\/p>\n<p><strong>Aim: <\/strong>This presentation will explain the concept of intervention fidelity, why it is important, and how it is measured. A study will be presented as an example of how fidelity can be measured. Here, the intervention is a teacher-led, shared-reading vocabulary intervention for preschool-aged children in Iceland. The relationship between implementation fidelity and children\u2019s outcomes will be discussed.<\/p>\n<p><strong>Method\/approach:<\/strong> Five preschools participated in the intervention (62 children, 11 teachers). Dose was measured by session attendance, session length, and exposure to target words during sessions. Adherence was the number of required elements delivered in each session. Quality was how well teachers\u2019 actions aligned with the intent of the intervention. Responsiveness was children\u2019s engagement. Children\u2019s language was assessed with a general language test and intervention-specific vocabulary probes before and after the intervention. Ethical approval was obtained from Visindasi\u00f0anefnd.<\/p>\n<p><strong>Results\/findings: <\/strong>On average children attended 80.2% of the lessons, received 342 minutes of intervention, and were exposed to target words 778 times (dose). Teachers\u2019 self-reported adherence was 91.3%, but only 56.5% when measured from recordings. The mean quality and responsiveness were both 3.9 out of 5. All aspects of fidelity were highly correlated. Responsiveness was most closely linked to children\u2019s language outcomes.<\/p>\n<p><strong>Conclusion: <\/strong>The findings highlight the complexity of measuring and interpreting fidelity in interventions conducted in real-world settings and high variations in children\u2019s individual experiences of fidelity.<\/p>\n<p><strong>Implications for children and families: <\/strong>This paper explains why it is important to monitor how interventions are implemented in preschools and how this can help ensure that preschool interventions are evidence-based.<\/p>\n<p><strong>Implications for practitioners:<\/strong> This paper explains the construct of fidelity and how it relates to understanding research evidence and effectively transferring it to classroom practice.<\/p>\n<p><strong>Funding: <\/strong>Menntaranns\u00f3knasj\u00f3\u00f0ur [219261-051].<\/p>\n<p><strong>Keywords<\/strong><strong>:<\/strong> multilingual, preschool, pedagogy, language, fidelity<\/p>\n<p><strong>This presentation relates to the following <\/strong><a href=\"https:\/\/sdgs.un.org\/goals\"><strong>United Nations Sustainable Development Goals:<\/strong><\/a><\/p>\n<ul class=\"cvc-sdgs\">\n<li><a href=\"https:\/\/sdgs.un.org\/goals\/goal4\">SDG 4: Quality Education<\/a><\/li>\n<li><a href=\"https:\/\/sdgs.un.org\/goals\/goal14\">SDG 14: Life Below Water<\/a><\/li>\n<li><a href=\"https:\/\/globalgoals.org\/goals\/15-life-on-land\/\">SDG 15: Life on Land<\/a><\/li>\n<\/ul>\n<p class=\"wp-block-paragraph\">\n","protected":false},"excerpt":{"rendered":"<p>Halla J\u00f3nsd\u00f3ttir, University of Iceland, Iceland; Kathryn Crowe, University of Iceland, Iceland; Susan Neuman, New York University, Steinhardt School of Culture, Education, and Human Development, United States; Bj\u00f6rg Einarsd\u00f3ttir, Kjarkur Rehabilitation Centre, Iceland<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[44,1],"tags":[46,34,35],"class_list":["post-1415","post","type-post","status-publish","format-standard","hentry","category-childrens-communication","category-presentations","tag-sdg-04","tag-sdg-14","tag-sdg-15"],"_links":{"self":[{"href":"https:\/\/childrensvoicesconference.csu.domains\/2026\/wp-json\/wp\/v2\/posts\/1415","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/childrensvoicesconference.csu.domains\/2026\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/childrensvoicesconference.csu.domains\/2026\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/childrensvoicesconference.csu.domains\/2026\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/childrensvoicesconference.csu.domains\/2026\/wp-json\/wp\/v2\/comments?post=1415"}],"version-history":[{"count":1,"href":"https:\/\/childrensvoicesconference.csu.domains\/2026\/wp-json\/wp\/v2\/posts\/1415\/revisions"}],"predecessor-version":[{"id":1474,"href":"https:\/\/childrensvoicesconference.csu.domains\/2026\/wp-json\/wp\/v2\/posts\/1415\/revisions\/1474"}],"wp:attachment":[{"href":"https:\/\/childrensvoicesconference.csu.domains\/2026\/wp-json\/wp\/v2\/media?parent=1415"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/childrensvoicesconference.csu.domains\/2026\/wp-json\/wp\/v2\/categories?post=1415"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/childrensvoicesconference.csu.domains\/2026\/wp-json\/wp\/v2\/tags?post=1415"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}