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Growth Planner API
Plot a student's projected growth using Lexile or Quantile measures.
About Growth Planner API
The Growth Planner allows users to track previous assessment results reported as Lexile and Quantile measures and use the current and historical assessment data to forecast and monitor growth toward key milestones from as early as 3rd grade. The growth forecast can be used to determine if the student is on track to be college and career ready by 12th grade.
Lexile Framework for Reading
The Lexile Framework for Reading is a scientific approach for measuring both reading comprehension ability and text complexity and places both measures on the Lexile scale. When used together, these measures can help match a reader with reading material at an appropriate difficulty or help give an idea of how well a reader will comprehend a text. Students may be matched with reading material that facilitates the optimal growth in their reading comprehension ability.
Lexile Reading Measures
Lexile® reading measures are reported as a number followed by a capital “L”. There is no space between the measure and the “L” and measures of 1,000 or greater are reported without a comma (e.g., 1050L). All Lexile reading measures should be rounded to the nearest 5L to avoid over interpretation of the measures. If the Lexile reading measure is xxx2.5 or higher or xxx7.5 or higher, round up to the next higher 5 Lexile.

APIs
- Scoring Service API
  Assigns an ability estimate to an assessment-taker in the form of a Lexile Reading, El Sistema Reading, or Quantile measure.
- Lexile Text Analyzer API
  Analyzes text to produce Lexile text measures on custom content.
- Titles API
  Access more than 470,000 hardcover, e-books, paperback, trade and other titles.
- Forecasting API
  Forecast an individual student or group performance on an upcoming assessment.
- Growth Planner API
  Plot a student's projected growth using Lexile or Quantile measures.
  - About Growth Planner API
    The Growth Planner allows users to track previous assessment results reported as Lexile and Quantile measures and use the current and historical assessment data to forecast and monitor growth toward key milestones from as early as 3rd grade. The growth forecast can be used to determine if the student is on track to be college and career ready by 12th grade.
    - Lexile Framework for Reading
      The Lexile Framework for Reading is a scientific approach for measuring both reading comprehension ability and text complexity and places both measures on the Lexile scale. When used together, these measures can help match a reader with reading material at an appropriate difficulty or help give an idea of how well a reader will comprehend a text. Students may be matched with reading material that facilitates the optimal growth in their reading comprehension ability.
      - Lexile Reading Measures
        Lexile® reading measures are reported as a number followed by a capital “L”. There is no space between the measure and the “L” and measures of 1,000 or greater are reported without a comma (e.g., 1050L). All Lexile reading measures should be rounded to the nearest 5L to avoid over interpretation of the measures. If the Lexile reading measure is xxx2.5 or higher or xxx7.5 or higher, round up to the next higher 5 Lexile.
    - Quantile Framework for Mathematics
      The Quantile® Framework for Mathematics is a scientific approach to measuring both the difficulty of a mathematical skill, concept or application (called Quantile Skill and Concept [QSC]) and a developing mathematician’s understanding of the QSCs in the following areas: Geometry; Measurement; Number Sense; Numerical Operations; Algebra and Algebraic Thinking; and Data Analysis and Probability.
  - API Calls
- Oral Reading API
  Measures a student's oral reading ability and the oral readability of text on the same scale.
- PowerV API
  Create and access vocabulary lists for over thousands of titles with the Titles Database.
- Career Database API
  Identify a career’s reading and math demands in Lexile and Quantile metrics for goal setting and career preparedness.

Lexile Reading Measures

Lexile® reading measures are reported as a number followed by a capital “L”. There is no space between the measure and the “L” and measures of 1,000 or greater are reported without a comma (e.g., 1050L). All Lexile reading measures should be rounded to the nearest 5L to avoid over interpretation of the measures. If the Lexile reading measure is xxx2.5 or higher or xxx7.5 or higher, round up to the next higher 5 Lexile.

For example if:

A Lexile reading measure for a student is 572.51, it should be reported as 575L.
A Lexile reading measure for a student is 577.42, it should be reported as 575L.

Measures that are below 0 should have the leading negative sign replaced with “BR” to signify that the measure represents a “Beginning Reader”. For example, a measure of -100L would be reported as BR100L. As with any test score, uncertainty in the form of measurement error is present; if uncertainties (i.e. numeric representations of measurement precision) are to be reported, the values should be rounded to the nearest whole number and include a trailing “L” after the number (e.g., 90L, 114L). For additional information please see the MetaMetrics, Inc. Marketing and Branding Guidelines document.

The measures that are reported for an individual student should reflect the purpose for which they will be used. If the purpose is accountability (at the student, school, or district level), then actual measures should be reported at all score points. If the purpose is instructional, then the scores should be capped at the upper bound of measurement error (e.g., at the 90th percentile point). In an instructional environment where the purpose of the Lexile reading measure is to appropriately match readers with books, no student should receive a negative Lexile reading measure. Therefore measures of 0L or below are reported as “BR” for “Beginning Reader”.

This table provides reporting caps by grade and course.

Table 1. Standard Lexile reading measures reported caps by grade and course
Grade	Lexile	Spanish Lexile	ELA Course
Lowest	BR400L or BR1300L*	BR
K	850L	750L
1	900L	850L
2	1100L	900L
3	1200L	1100L
4	1300L	1200L
5	1400L	1300L
6	1500L
7	1600L
8	1700L
9	1725L		English I
10	1750L		English II
11	1800L
12	1825L

*The BR lower bound cap is determined by the description of the construct being measured and the presence of foundational reading items. MetaMetrics will confirm which lower bound BR cap should be used with the scoring service.