{"id":25553,"date":"2025-08-28T05:00:00","date_gmt":"2025-08-28T12:00:00","guid":{"rendered":"https:\/\/www.nwea.org\/blog\/?p=25553"},"modified":"2025-10-01T13:58:32","modified_gmt":"2025-10-01T20:58:32","slug":"why-instructional-time-matters-for-fair-comparisons-of-student-achievement","status":"publish","type":"post","link":"https:\/\/www.nwea.org\/blog\/2025\/why-instructional-time-matters-for-fair-comparisons-of-student-achievement\/","title":{"rendered":"Getting precise: Why instructional time matters for fair comparisons of student achievement"},"content":{"rendered":"<p style=\"font-weight: 400;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-25555\" src=\"https:\/\/www.nwea.org\/blog\/uploads\/2025\/08\/why-instructional-time-matters-for-fair-comparisons-of-student-achievement_850x300_hero.jpg\" alt=\"\" width=\"850\" height=\"300\" srcset=\"https:\/\/www.nwea.org\/blog\/uploads\/2025\/08\/why-instructional-time-matters-for-fair-comparisons-of-student-achievement_850x300_hero.jpg 850w, https:\/\/www.nwea.org\/blog\/uploads\/2025\/08\/why-instructional-time-matters-for-fair-comparisons-of-student-achievement_850x300_hero-300x106.jpg 300w, https:\/\/www.nwea.org\/blog\/uploads\/2025\/08\/why-instructional-time-matters-for-fair-comparisons-of-student-achievement_850x300_hero-768x271.jpg 768w, https:\/\/www.nwea.org\/blog\/uploads\/2025\/08\/why-instructional-time-matters-for-fair-comparisons-of-student-achievement_850x300_hero-720x254.jpg 720w\" sizes=\"(max-width: 850px) 100vw, 850px\" \/>As we continue our <a href=\"https:\/\/www.nwea.org\/blog\/author\/karynlewis\/\">series on the 2025 MAP\u00ae Growth\u2122 norms<\/a>, it\u2019s time to highlight one of the most powerful, but often overlooked, features that sets these norms apart: their precision around instructional time.<\/p>\n<p style=\"font-weight: 400;\">Many assessments take a blunt approach to timing, for instance, grouping all fall testers together regardless of whether they tested in late August or early October. But \u201cfall\u201d doesn\u2019t mean the same thing for every district or even every school in a district.<\/p>\n<p style=\"font-weight: 400;\"><a href=\"https:\/\/www.nwea.org\/map-growth\/\">MAP Growth<\/a> takes a more nuanced approach by accounting for the actual number of weeks of instruction a student has received before testing. After all, we wouldn\u2019t expect a student who hasn\u2019t had any instruction to perform at the same level as someone who\u2019s had seven weeks of math class. So why would we interpret their test scores the same way?<\/p>\n<h2 style=\"font-weight: 400;\">Why instructional time matters<\/h2>\n<p style=\"font-weight: 400;\">Imagine three students\u2014Riu, Dahlia, and Kari\u2014all in third grade, all earning the same <a href=\"https:\/\/www.nwea.org\/blog\/2025\/how-the-map-growth-rit-scale-offers-valuable-insights-into-student-growth\/\">RIT score<\/a> of 175 on their fall MAP Growth math test. Same score, same grade, so they\u2019re achieving at the same level, right? Not necessarily. Riu\u2019s school tests right at the start of the year, in week 0. Dahlia\u2019s school tests in week 4. Kari\u2019s school waits until week 7. Technically, all three students tested in the fall, but they\u2019ve had very different amounts of instructional time.<\/p>\n<p style=\"font-weight: 400;\">Under <a href=\"https:\/\/www.nwea.org\/resource-center\/resource\/2025-map-growth-norms-technical-manual\/\">the 2025 norms<\/a>, a RIT score of 175 in third-grade math corresponds to different percentile rankings depending on the amount of instruction: it\u2019s at the 33rd percentile at week 0, the 28th percentile at week 4, and the 25th percentile at week 7. These differences have real implications. Many districts use the 30th percentile as a cut score to identify students for intensive intervention. So Riu, who tested early, wouldn\u2019t be flagged for additional support. But Dahlia, who tested just a few weeks later, would fall below the threshold. Kari, who tested even later, would fall further still.<\/p>\n<p style=\"font-weight: 400;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-25556\" src=\"https:\/\/www.nwea.org\/blog\/uploads\/2025\/08\/why-instructional-time-matters-for-fair-comparisons-of-student-achievement_850x528_sampleRITScoreComparison.png\" alt=\"A table illustrates how a RIT score of 175 on a third-grade MAP Growth math test places a student who tests in week 0 of fall term above the cut score while students who test later in the term fall below it.\" width=\"850\" height=\"528\" srcset=\"https:\/\/www.nwea.org\/blog\/uploads\/2025\/08\/why-instructional-time-matters-for-fair-comparisons-of-student-achievement_850x528_sampleRITScoreComparison.png 850w, https:\/\/www.nwea.org\/blog\/uploads\/2025\/08\/why-instructional-time-matters-for-fair-comparisons-of-student-achievement_850x528_sampleRITScoreComparison-300x186.png 300w, https:\/\/www.nwea.org\/blog\/uploads\/2025\/08\/why-instructional-time-matters-for-fair-comparisons-of-student-achievement_850x528_sampleRITScoreComparison-768x477.png 768w, https:\/\/www.nwea.org\/blog\/uploads\/2025\/08\/why-instructional-time-matters-for-fair-comparisons-of-student-achievement_850x528_sampleRITScoreComparison-720x447.png 720w\" sizes=\"(max-width: 850px) 100vw, 850px\" \/>Each of these students got the same score on the same test in the same season, but the timing of their assessment could influence whether they are flagged for intervention, how their teachers interpret their progress, and how their families understand their needs. This is why accounting for instructional time isn\u2019t just a technical feature, it\u2019s also essential for fairness and accurate decision-making.<\/p>\n<h2 style=\"font-weight: 400;\">The challenge: Default settings can lead to misinterpretation<\/h2>\n<p style=\"font-weight: 400;\">Here\u2019s where many districts unintentionally run into trouble: they rely on default instructional weeks while giving schools flexibility in when they actually test.<\/p>\n<p style=\"font-weight: 400;\">It\u2019s an understandable shortcut. Testing logistics are complex, and standardizing settings across a district can feel like a practical way to manage them. Often, the defaults\u2014week 4 for fall, week 32 for spring\u2014are set once and left alone. However, when districts use the NWEA <a href=\"https:\/\/connection.nwea.org\/s\/article\/What-testing-windows-are-used-in-the-norms?language=en_US\">default instructional weeks<\/a> but allow schools flexibility in their actual testing dates, the data can become misleading. Consider a district that sets fall testing for instructional week 4 across all schools but allows a four-week testing window. The system assumes all students tested after four weeks of instruction, when in reality, some had just two weeks and others had six.<\/p>\n<p style=\"font-weight: 400;\">These differences may sound small, but they can distort both achievement percentiles and growth metrics, leading to interpretations that don\u2019t reflect what\u2019s really happening in classrooms.<\/p>\n<h2 style=\"font-weight: 400;\">The impact on your data<\/h2>\n<p style=\"font-weight: 400;\">Let\u2019s take a closer look at how this plays out in practice. Imagine Valley View School District uses the default instructional weeks within the MAP Growth system: week 4 for fall and 32 for spring. However, it\u2019s common for defaults to stay in place even when school testing schedules vary.<\/p>\n<p style=\"font-weight: 400;\">The illustration below shows how this mismatch plays out. Both Adams and Grant schools appear to be using the same default instructional week settings, but in practice, students end up testing on very different dates\u2014often because defaults are left in place without aligning to actual testing schedules. In this example, Adams tests in weeks 2 and 34 while Grant tests in weeks 6 and 30. This creates an eight-week difference in actual instructional time. That difference can significantly impact percentile interpretations, even if the test scores themselves don\u2019t change.<\/p>\n<p style=\"font-weight: 400;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-25558\" src=\"https:\/\/www.nwea.org\/blog\/uploads\/2025\/08\/why-instructional-time-matters-for-fair-comparisons-of-student-achievement_850x580_sampleInstructionalWeeksAndAssessmentWindows.png\" alt=\"A graph illustrates how two schools in the same district, given the same default instructional week settings but permitted to have students test on very different dates, can see either inflated or deflated growth percentiles resulting from different amounts of instructional time.\" width=\"850\" height=\"580\" srcset=\"https:\/\/www.nwea.org\/blog\/uploads\/2025\/08\/why-instructional-time-matters-for-fair-comparisons-of-student-achievement_850x580_sampleInstructionalWeeksAndAssessmentWindows.png 850w, https:\/\/www.nwea.org\/blog\/uploads\/2025\/08\/why-instructional-time-matters-for-fair-comparisons-of-student-achievement_850x580_sampleInstructionalWeeksAndAssessmentWindows-300x205.png 300w, https:\/\/www.nwea.org\/blog\/uploads\/2025\/08\/why-instructional-time-matters-for-fair-comparisons-of-student-achievement_850x580_sampleInstructionalWeeksAndAssessmentWindows-768x524.png 768w, https:\/\/www.nwea.org\/blog\/uploads\/2025\/08\/why-instructional-time-matters-for-fair-comparisons-of-student-achievement_850x580_sampleInstructionalWeeksAndAssessmentWindows-720x491.png 720w\" sizes=\"(max-width: 850px) 100vw, 850px\" \/>At Grant Elementary, students actually take the fall test in week 6 and the spring test in week 30. That means they\u2019ve had more instruction than the system assumes before their fall test, but less instruction between fall and spring. As a result, their fall achievement percentiles may appear slightly higher than they should because the system is comparing their scores to students who had less time to learn. But when spring rolls around, the opposite happens: growth percentiles may seem lower than expected because the system believes students had a full 28 weeks of instruction to grow, when in reality they only had 24.<\/p>\n<p style=\"font-weight: 400;\">Meanwhile, over at Adams Elementary, students take the fall test in week 2 and the spring test in week 34. In this case, they\u2019ve had less instructional time than assumed before the fall test and more between fall and spring. Their fall achievement percentiles may look artificially low, as they\u2019re being compared to students who had more time to learn. But by spring, their growth may appear stronger than it really is, simply because they had four more weeks of learning time than the system accounted for.<\/p>\n<p style=\"font-weight: 400;\">On paper, it might look like Adams made impressive gains and Grant fell behind. But these differences in perceived performance may have more to do with mismatched instructional weeks than with any actual differences in teaching or learning.<\/p>\n<h2 style=\"font-weight: 400;\">Moving toward a more accurate interpretation<\/h2>\n<p style=\"font-weight: 400;\">The goal when considering instructional time before a testing event isn\u2019t to create additional administrative burden, but to ensure your data tells an accurate story. Having <a href=\"https:\/\/connection.nwea.org\/s\/article\/How-to-modify-instructional-weeks?language=en_US&amp;r=1&amp;ui-knowledge-aloha-components-aura-components-knowledgeone.ArticleActions.handleEditPublished=1\">schools set instructional weeks<\/a> that reflect their actual testing patterns rather than using district-wide defaults can improve the accuracy of your percentile rankings and growth calculations.<\/p>\n<p style=\"font-weight: 400;\">When instructional weeks align more closely with reality, you get clearer pictures of student achievement and growth. You can trust that a student\u2019s 60th percentile growth ranking reflects genuine progress, not a timing artifact.<\/p>\n<h2 style=\"font-weight: 400;\">Making the most of precision<\/h2>\n<p style=\"font-weight: 400;\">Accounting for instructional time with precision is one of the enduring strengths of MAP Growth, as I discussed in <a href=\"https:\/\/www.nwea.org\/blog\/2025\/whats-new-in-the-2025-map-growth-norms\/\">\u201cSame scale, new reference: What\u2019s new in the 2025 MAP Growth norms?\u201d<\/a> It\u2019s baked into the 2025 norms and supported by our rigorous methodology. But like any powerful tool, it works best when it\u2019s used correctly.<\/p>\n<p style=\"font-weight: 400;\">If you\u2019re using MAP Growth to monitor student progress, evaluate programs, or inform high-stakes decisions, now is the time to ensure your instructional week settings are dialed in. A small adjustment can make a big difference in what your data is really telling you. Let your data reflect what matters most: your students\u2019 learning, not just your calendar.<\/p>\n<p style=\"font-weight: 400;\">To learn more, read our articles <a href=\"https:\/\/www.nwea.org\/blog\/2025\/whats-new-in-the-2025-map-growth-norms\/\">\u201cSame scale, new reference: What\u2019s new in the 2025 MAP Growth norms,\u201d<\/a> <a href=\"https:\/\/www.nwea.org\/blog\/2025\/what-can-you-do-with-the-2025-map-growth-norms\/\">\u201cWhat can you do with the 2025 MAP Growth norms? Turning test results into action,\u201d<\/a> and <a href=\"https:\/\/www.nwea.org\/blog\/2025\/rethinking-growth-goals-with-2025-map-growth-norms\/\">\u201cRealistic vs. meaningful growth: Rethinking growth goals with 2025 MAP Growth norms.\u201d<\/a> I also encourage you to watch our <a href=\"https:\/\/www.nwea.org\/resource-center\/resource\/same-scale-new-reference-whats-new-in-the-2025-map-growth-norms\/\">on-demand webinar<\/a> and our video titled <a href=\"https:\/\/youtu.be\/uMBkplM2jDM?si=GkRvWJhJ7K4pzT2Y\">&#8220;<span style=\"font-size: revert;\">MAP Growth norms: How NWEA measures growth and achievement<\/span>.&#8221;<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>As we continue our series on the 2025 MAP\u00ae Growth\u2122 norms, it\u2019s time to highlight one of the most powerful, but often overlooked, features that sets these [&hellip;]<\/p>\n","protected":false},"author":236,"featured_media":25560,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_yoast_wpseo_metadesc":"One of the most powerful, but often overlooked, features of the 2025 MAP Growth norms is their precision around instructional time.","footnotes":""},"categories":[559],"tags":[637],"grade_level":[830,831,832,833],"product":[835],"theme":[],"coauthors":[{"id":236,"name":"Karyn Lewis, NWEA","link":"https:\/\/www.nwea.org\/blog\/author\/karynlewis\/","avatar_urls":{"24":"https:\/\/www.nwea.org\/blog\/uploads\/2025\/07\/cropped-Karyn-Lewis-24x24.png","48":"https:\/\/www.nwea.org\/blog\/uploads\/2025\/07\/cropped-Karyn-Lewis-48x48.png","96":"https:\/\/www.nwea.org\/blog\/uploads\/2025\/07\/cropped-Karyn-Lewis-96x96.png"}}],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v19.14 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Getting precise: Why instructional time matters for fair comparisons of student achievement - Teach. 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