i-Ready Inform and Renaissance Star Assessments are both adaptive tools that help schools understand achievement and growth, but they differ in testing time, score labels, reporting design, and how frequently they may be used. i-Ready emphasizes grade-level placement, detailed Reading and Mathematics domains, and individualized Typical Growth and Stretch Growth targets. Star emphasizes a Unified Scaled Score, Percentile Rank, benchmark categories, Student Growth Percentile, and brief screening or progress-monitoring cycles.
For 2026–2027, the i-Ready Diagnostic name changes to i-Ready Inform, and a shorter assessment experience with fewer items and breaks is available. Renaissance continues to describe Star as a family of brief computer-adaptive assessments for early literacy, reading, and mathematics, with screening commonly conducted in fall, winter, and spring and more frequent monitoring available when needed.
Neither assessment is automatically “better,” and their main scores cannot be converted with a homemade table. The right choice depends on the question a school needs to answer, the age and subject tested, the approved local assessment plan, and the instructional response that follows.
i-Ready vs Star Assessments: quick comparison
| Feature | i-Ready Inform | Renaissance Star Assessments |
|---|---|---|
| Developer | Curriculum Associates | Renaissance |
| Core adaptive subjects | Reading and Mathematics | Early Literacy, Reading, and Mathematics; the broader suite includes additional assessment types |
| Typical grade span | Grades K–12 for adaptive Reading and Mathematics | Pre-K through Grade 12 across the Star family; exact span depends on the assessment |
| Primary achievement score | i-Ready scale score | Star Unified Scaled Score |
| Grade expectation context | Above, On, or Below Grade Level placements, including Early/Mid/Late On Grade Level | Benchmark categories, Percentile Rank, Grade Equivalent, and state or district context where configured |
| Growth model | Typical Growth and Stretch Growth, plus observed scale-score growth | Student Growth Percentile and change in Scaled Score |
| Testing frequency | Up to three Inform administrations per year; separate monitoring tools may be used between them | Commonly three screening windows; Renaissance says schools may screen two to five times and may monitor interventions more frequently |
| Approximate time | About 30–60 minutes per subject, often split into shorter sessions; the 2026–2027 version is shorter | Typically about 20 minutes for computer-adaptive tests; about 15 minutes for Star Early Literacy and roughly 20–30 minutes for Star Math |
| Direct score conversion? | No universal i-Ready-to-Star conversion should be assumed. | |
These are general publisher descriptions. A district’s test version, language, accommodations, subject, grade, state approval, and reporting configuration can change what an individual student sees.
What changed for i-Ready in 2026–2027?
Beginning in the 2026–2027 school year, Curriculum Associates renamed i-Ready Diagnostic as i-Ready Inform for Reading and Mathematics. The company says the new name better communicates the assessment’s main purpose: informing instruction for teachers, students, and families.
The change is not a switch to an unrelated test from a new provider. Curriculum Associates states that Inform maintains the valid and reliable data, reports, and instructional support associated with the Diagnostic. A shorter experience with fewer questions and breaks is also available in 2026–2027, although the shortened version may not be immediately available for every state use.
Schools and families may still see the word “Diagnostic” in older reports, training materials, URLs, or local communication during the transition. In this guide, i-Ready Inform refers to the assessment previously called i-Ready Diagnostic. Our What Is i-Ready Inform? guide explains the name change and current score charts in detail.
What is i-Ready Inform?
i-Ready Inform is a computer-adaptive assessment for Reading and Mathematics in Grades K–12. Adaptive means the difficulty changes in response to student answers. Correct responses can lead to more challenging items, while incorrect responses can lead to easier items. The assessment continues until it has enough evidence under its test rules to estimate performance.
The goal is to identify what a student likely knows, where important prerequisites may be missing, how performance aligns with grade-level criteria, and how much growth has occurred. Reports can connect the overall result with skill domains, student groupings, teacher-led resources, and i-Ready Personalized Instruction when the school licenses that product.
Inform is not the same as My Path. Inform is the assessment. My Path is the sequence of personalized lessons that may be informed by assessment data. A school can use i-Ready for assessment only, instruction only in some contexts, or as a connected system.
What are Renaissance Star Assessments?
Star Assessments are a family of research-based assessments from Renaissance. The suite includes computer-adaptive tests and other measures designed for screening, progress monitoring, instructional planning, and growth reporting. Its academic adaptive products include Star Early Literacy, Star Reading, and Star Math, with Spanish-language options available for several assessments.
Star Reading measures overall reading achievement and comprehension for students from kindergarten through Grade 12. Star Math measures K–12 mathematics achievement across areas such as Numbers and Operations, Algebra, Geometry and Measurement, and Data Analysis, Statistics, and Probability. Star Early Literacy focuses on foundational literacy and numeracy development for pre-K through Grade 3.
Star’s brief administration is a central design feature. Renaissance says the computer-adaptive Star tests generally produce reliable results in about 20 minutes. Star Reading is typically about 20 minutes, Star Math about 20–30 minutes, and Star Early Literacy about 15 minutes. Those are typical durations rather than strict time limits for every child.
How adaptive testing works
Both systems use computer-adaptive technology. Every student does not receive the same fixed form. The system selects items partly in response to prior answers while following content and measurement rules. This allows a test to gather evidence from students performing below, at, or above their enrolled grade without giving every student an extremely long set of questions.
Adaptive tests are designed to include questions that feel difficult. An incorrect answer does not automatically damage the result in the same way as a missed item on a simple classroom percentage test. The algorithm needs a pattern of correct and incorrect responses to estimate the edge of current performance.
Students should work independently, read or listen to directions carefully, use approved accommodations, and avoid rapid guessing. Adults should not explain items or supply answers during either assessment. Coaching changes the evidence and can produce an inflated result that leads to inappropriate instructional decisions.
i-Ready scores explained
Scale Score
The i-Ready scale score places performance on the i-Ready scale for Reading or Mathematics. It is not a percentage correct, a grade, or the number of mastered skills. The subject, rostered grade, and testing season are essential for interpretation.
Grade-level placement
Placement compares the scale score with grade-specific criteria. Relative labels can include Above Grade Level, Early/Mid/Late On Grade Level, One Grade Level Below, Two Grade Levels Below, or Three or More Grade Levels Below. Absolute placement may identify a particular grade band associated with performance.
Early, Mid, and Late On Grade Level are not the same as fall, winter, and spring. They describe locations within the on-grade placement range, not the month of testing.
Percentile Rank
Percentile rank compares the result with a nationally representative sample of same-grade students who tested at the same time of year. A percentile of 65 means the score equaled or exceeded the scores of about 65 percent of the relevant norm group. It does not mean 65 percent of questions were correct.
Typical Growth
Typical Growth is an individualized annual benchmark based on the student’s grade, subject, and beginning placement. It represents the amount of growth expected for a student with a similar starting profile in i-Ready’s model.
Stretch Growth
Stretch Growth is a more ambitious individualized target. For students below grade level, it is intended to support movement toward proficiency; for students already meeting expectations, it can provide additional challenge. Typical and Stretch targets are not universal point amounts.
Domain performance
Reading reports may include Phonological Awareness, Phonics, High-Frequency Words, Vocabulary, Comprehension of Literature, and Comprehension of Informational Text. Math reports may include Number and Operations, Algebra and Algebraic Thinking, Measurement and Data, and Geometry. The exact domains depend on grade and assessment evidence.
An overall score can hide an uneven pattern. Educators should examine domains before choosing instruction. For additional context, see our step-by-step i-Ready report guide.
Star Assessment scores explained
Unified Scaled Score
The Star Scaled Score is the fundamental achievement score used to compare performance over time and across grades. Renaissance’s Unified Scale extends from 0 to approximately 1400 overall. Star Early Literacy scores generally occupy about 200–1100, while Star Reading and Star Math generally occupy about 600–1400.
These shared numerical ranges still require caution. Renaissance explicitly notes that a score in one Star program should not automatically be treated as the same achievement in another program. A Star Early Literacy score of 900 does not automatically mean exactly the same thing as a Star Reading or Star Math score of 900.
Percentile Rank
Star Percentile Rank ranges from 1 to 99 and compares the student’s performance with other students in the same grade nationally. A PR of 37 means the student performed as well as or better than about 37 percent of same-grade students in the national comparison group.
Benchmark Categories
Star reports can place students into benchmark categories tied to state, district, or school expectations. The category labels and cut scores can vary because the local or state benchmark configuration matters. Families should read the category definition printed on their own report rather than applying a chart from another district.
Student Growth Percentile
Student Growth Percentile, or SGP, describes how a student’s growth compares with academic peers—students in the same grade with similar prior scaled-score histories. SGP ranges from 1 to 99. An SGP of 75 means the student grew more than about 75 percent of academic peers in the comparison model. Renaissance describes 50 as expected or typical relative growth.
SGP is not the same as Percentile Rank. PR describes current achievement relative to same-grade peers. SGP describes the rate of growth relative to academic peers. A student can have high achievement with lower growth, or lower achievement with high growth.
Grade Equivalent
Grade Equivalent compares the student’s test performance with the national average performance observed at other grade levels and months. It is frequently misunderstood. If a fourth grader receives a GE associated with a later grade, it does not prove that the student has mastered the full curriculum of that later grade or should automatically skip a grade.
Instructional Reading Level and ZPD
Star Reading reports may include an Instructional Reading Level and a Zone of Proximal Development. ZPD describes a range of text difficulty intended to support successful, growth-oriented reading practice, often in connection with Renaissance reading tools. These fields are not direct equivalents of i-Ready Reading placement or Lexile measures.
Domain and standards information
Star reports and dashboards can provide domain scores, estimated mastery, state-standards information, and skills students may be ready to learn next. A Renaissance Diagnostic report may show domain scores from 0 to 99 as proficiency estimates—the likelihood of correctly answering items in that domain—not simply the percentage of administered domain questions answered correctly.
i-Ready score vs Star Scaled Score
| Question | i-Ready | Star |
|---|---|---|
| Main achievement number | Scale Score | Unified Scaled Score |
| Percent correct? | No | No |
| National comparison | Percentile Rank | Percentile Rank |
| Grade expectation context | Grade-level placement labels | Benchmark categories and related report context |
| Growth context | Typical Growth and Stretch Growth | Student Growth Percentile |
| Directly convertible? | No general direct conversion is established by matching the raw numbers. | |
An i-Ready score of 550 is not automatically equivalent to a Star score of 900, 1000, or any other number. The assessments use different item banks, models, content blueprints, score scales, norms, and reporting rules. A credible conversion requires a validated linking study for the exact assessments, grades, subjects, editions, seasons, population, and intended decision.
Do not build a crosswalk by placing two publisher grade-average charts side by side. Similar grade averages do not establish individual-score equivalence, and a correlation does not by itself produce an accurate conversion for every student.
Testing time: i-Ready vs Star
Testing time is one of the clearest practical differences.
- i-Ready Inform: Curriculum Associates’ family guidance describes about 30–60 minutes per subject depending on grade, usually divided into shorter sittings. The 2026–2027 experience has fewer items and breaks, but local or state versions may vary.
- Star Reading: Renaissance describes a typical administration of about 20 minutes.
- Star Math: Renaissance describes roughly 20–30 minutes, while the broader Star FAQ summarizes computer-adaptive tests as typically about 20 minutes.
- Star Early Literacy: Renaissance describes a typical administration of about 15 minutes.
Shorter does not automatically mean less accurate, and longer does not automatically mean better. Test designs collect different types and amounts of evidence. The right question is whether the assessment produces reliable information for its intended decision without taking unnecessary instructional time.
How often are i-Ready and Star given?
i-Ready Inform is commonly administered at the beginning, middle, and end of the school year—up to three administrations. The first creates a baseline, the second checks progress and instructional response, and the third summarizes growth. i-Ready Growth Monitoring or other local measures can provide shorter checks between Inform administrations.
Renaissance recommends Star universal screening three times per year in many settings. Its current FAQ says schools may screen two to five times per year depending on tracking needs and may use Star as often as weekly for intervention progress monitoring. A district should define which administrations are benchmark screenings and which are progress checks.
More testing is not always more information. Repeated testing without an instructional purpose can reduce learning time and student engagement. Each administration should answer a planned question and lead to a decision.
Reading assessment differences
i-Ready Reading is designed to produce an overall score, grade-level placement, growth targets, and domain information covering foundational reading, vocabulary, and comprehension. Older students may test out of some foundational domains when the assessment has enough evidence that those skills are secure.
Star separates its early-literacy and broader reading products. Star Early Literacy focuses on foundational development for younger learners, while Star Reading measures overall reading achievement and comprehension through Grade 12. Star Reading reports may include IRL, ZPD, Grade Equivalent, Estimated Oral Reading Fluency, Lexile information, and skill recommendations depending on the report and configuration.
The reporting philosophies overlap but are not identical. i-Ready’s placement label can be highly visible to families, while Star family materials highlight Scaled Score, benchmark category, Percentile Rank, and Grade Equivalent. Teachers using either system should examine skill evidence rather than relying only on the headline number.
Math assessment differences
i-Ready Mathematics reports an overall scale score with grade-level placement and domains such as Number and Operations, Algebra and Algebraic Thinking, Measurement and Data, and Geometry. Current high-school reporting may depend on whether the school uses Integrated or Traditional mathematics pathways.
Star Math covers K–12 achievement in Numbers and Operations, Algebra, Geometry and Measurement, and Data Analysis, Statistics, and Probability. Renaissance reports can connect results to learning progressions, standards, instructional planning, benchmarks, and growth.
A domain with a similar name is not guaranteed to have identical content or weighting across the two assessments. “Algebra” on one report should not be numerically converted into an algebra domain result from the other.
Growth: Typical/Stretch Growth vs SGP
This is another major difference. i-Ready Typical Growth and Stretch Growth are individualized goal measures within the i-Ready model. Typical Growth is the expected annual target for a similar starting profile. Stretch Growth is a more ambitious target intended to support movement toward proficiency or additional challenge.
Star SGP is a norm-referenced comparison of observed growth. It asks how the student’s growth compares with the growth of academic peers who share a similar grade and achievement history. An SGP near 50 represents typical relative growth in Renaissance’s explanation.
Meeting 100 percent of i-Ready Typical Growth is not the same as earning an SGP of 100. The first means the individualized i-Ready target was met. The second, if reported, would indicate extremely high relative growth within the Star SGP distribution. The scales and questions are different.
Our parent guide to Typical and Stretch Growth explains i-Ready’s two targets more fully.
Which assessment is better for progress monitoring?
Star’s short adaptive tests and stated option for frequent monitoring can make it attractive for schools seeking repeated achievement checks during intervention. Star also offers other curriculum-based and specialized measures within the broader Renaissance assessment suite.
i-Ready Inform is typically a less frequent, deeper benchmark administration paired with individualized growth goals and detailed instructional connections. Schools can use i-Ready Growth Monitoring or Literacy Tasks between benchmark windows when those tools are part of the assessment plan.
The better design depends on purpose. A universal screening decision, a weekly intervention check, a detailed prerequisite analysis, and an end-of-year growth summary are not the same task. Districts should select a measure validated for the specific use rather than applying one assessment to every question.
How parents should read either report
- Confirm the product and subject. Identify i-Ready Reading, i-Ready Math, Star Reading, Star Math, or Star Early Literacy.
- Check grade and date. Record the rostered grade and fall, winter, spring, or progress-monitoring window.
- Read the main score on its own scale. Do not mix an i-Ready scale score with a Star Unified Scaled Score.
- Read grade-level or benchmark context. Use the official placement or benchmark settings shown on the current report.
- Read Percentile Rank. Remember that it is a national comparison, not percent correct.
- Separate achievement from growth. High achievement does not guarantee high recent growth.
- Review domains and skills. Find strengths and needs hidden by the overall score.
- Check test validity. Consider rushing, interruptions, fatigue, language access, and accommodations.
- Compare with classroom evidence. Include daily work, teacher observations, curriculum assessments, and other measures.
- Ask what happens next. A useful report conversation ends with an instructional action.
What is a good score?
Neither system has one universal “good score” for all grades and subjects. In i-Ready, start with the student’s grade-specific placement, prior result, domain profile, and progress toward Typical or Stretch Growth. In Star, start with the Scaled Score, benchmark category, Percentile Rank, prior score, and SGP when available.
A below-benchmark student can make excellent progress without yet reaching the proficiency category. A student already performing above expectations may add fewer raw points while continuing to learn appropriately. A single label should not erase the growth trajectory or the specific skill profile.
If a result is sharply different from classroom performance, investigate before labeling the student. Rushing, illness, anxiety, technology problems, misunderstood directions, an interrupted session, or a missing accommodation can affect the evidence.
Can schools use both assessments?
Yes, but the school should define why. One assessment may serve as a district benchmark while another supports a particular instructional program or intervention. Using both can provide additional evidence, but it can also duplicate testing and produce confusing score discussions.
If both are used, educators should keep each score in its own reporting system. Compare broad patterns—such as whether both show stronger comprehension and weaker vocabulary—while avoiding fabricated raw-score conversions. Percentile ranks can offer cautious contextual comparison when the grade, subject, season, and norm references are matched, but even similar percentiles do not make the underlying scale scores equivalent.
Which one should a school choose?
Consider these questions:
- What decision must the assessment support: screening, instructional planning, progress monitoring, growth reporting, or state-test projection?
- Which grades, languages, and subjects need coverage?
- How much testing time is acceptable?
- How often will data be collected and acted upon?
- Which reports are understandable to teachers and families?
- How well does the tool align with the curriculum and state standards?
- What accommodations and accessibility supports are available?
- Is the assessment approved for the intended local or state use?
- What professional learning and data-review process will accompany implementation?
- Will the results lead to timely instruction rather than sit unused?
Product features matter, but implementation matters too. A technically strong assessment can be misused through excessive testing, invalid comparisons, poor conditions, or decisions based on one number. A clear assessment plan is as important as the brand selected.
Frequently asked questions
Is i-Ready the same as Star?
No. They are separate assessment systems from different developers. Both use adaptive technology for core academic assessments, but their items, scales, norms, growth models, and reports differ.
Did i-Ready Diagnostic become i-Ready Inform?
Yes. Curriculum Associates changed the name beginning in 2026–2027. The company describes Inform as the continuation of the assessment with the same core data and reporting purpose, plus a shorter experience.
Is Star shorter than i-Ready?
Typically, yes. Renaissance describes Star adaptive tests as roughly 15–30 minutes depending on the product, while Curriculum Associates describes i-Ready Inform as about 30–60 minutes per subject, often split into sessions. Actual time varies by student and local version.
Can an i-Ready score be converted to a Star score?
Do not assume a direct conversion. A defensible crosswalk requires a validated linking study for the exact products, grades, subjects, versions, seasons, population, and intended use.
Is Star Scaled Score a percentage?
No. It is a measurement-scale result based on item difficulty and response performance. Percentile Rank is a separate national comparison.
Is i-Ready placement the same as a Star benchmark category?
No. Both add grade or proficiency context, but their criteria, cut scores, labels, and validation work differ. Use the definitions on the current official report.
Is Grade Equivalent the student’s instructional grade?
No. A Star Grade Equivalent is a comparison with national average performance at another grade and month. It does not prove mastery of the complete curriculum or justify automatic grade acceleration.
Is i-Ready Typical Growth the same as Star SGP?
No. Typical Growth is progress toward an individualized i-Ready benchmark. SGP compares Star growth with the growth of academic peers.
Can a student score differently on the two assessments?
Yes. Differences can result from content coverage, domain weighting, administration date, engagement, accommodations, measurement uncertainty, and each system’s scale and norms. Review the complete reports instead of forcing agreement.
Which report should parents trust?
Use both as pieces of evidence when both were administered validly. Neither should replace classroom work, teacher judgment, curriculum assessments, or other required measures.
Bottom line
i-Ready Inform and Star Assessments both help schools understand learning, but they are designed and reported differently. i-Ready provides a scale score, grade-level placement, percentile rank, domains, and individualized Typical and Stretch Growth. Star provides a Unified Scaled Score, Percentile Rank, benchmark categories, SGP, and additional fields such as Grade Equivalent, ZPD, or standards mastery depending on the product and report.
Star is generally briefer and can be used more frequently for monitoring. i-Ready Inform usually provides a longer benchmark experience with detailed placement and instructional connections, although its 2026–2027 version is shorter than before. The best choice is the one validated for the school’s purpose and used within a thoughtful assessment plan.
Do not directly convert i-Ready scores into Star scores. Interpret each number with the correct official resources, match the grade, subject, season, and norms, and turn the evidence into an appropriate next step for instruction.
Official sources
- Curriculum Associates: i-Ready Inform announcement for 2026–2027
- Curriculum Associates: 2026–2027 i-Ready product updates
- Curriculum Associates: i-Ready resources for families
- Renaissance: Star Assessments overview and FAQs
- Renaissance: Star Reading overview and testing time
- Renaissance: Star Math overview and testing time
- Renaissance: Understanding the Star Family Report
- Renaissance: Student Growth Percentile explained
- Renaissance Star Help: Unified Scale guidance
RevisionTown is not affiliated with Curriculum Associates or Renaissance. Product names belong to their respective owners. This guide is educational and does not replace an official score report, district assessment policy, or professional evaluation.
