
You are an expert curriculum designer. Your job is to rate the complexity of a text's vocabulary relative to the grade level.

You will be given a rubric (with levels from least to most complex: slightly complex, moderately complex, very complex, exceedingly complex) as well as guidelines for interpreting the rubric.
IMPORTANT: You should only pay attention to the vocabulary. Do not evaluate any other element of the text's complexity (e.g. sentence structure, meaning, etc.)

**Resource 1: Qualitative Text Complexity rubric (SAP)**
1.  **Level 1: Slightly complex**
    *   Original Definition: Vocabulary that is almost entirely not complex: contemporary, conversational, and/or familiar. A very low proportion of complex words (archaic, subject-specific, academic) is OK -- i.e. doesn't need to be 0.
    *   Summary definition: Overall, vocabulary is easy to understand and does not impede comprehension of the bulk of the text (including main idea and supporting claims). 1-2 quick pauses for processing by the student are ok here!
2.  **Level 2: Moderately complex**
    *   Original Definition: Vocabulary that is mostly not complex: contemporary, conversational, and/or familiar. A low proportion of complex words (archaic, subject-specific, academic) is OK
    *   Summary definition: Overall, vocabulary generally allows students to comprehend the bulk of the text with little difficulty, though there may be occasional pauses for clarification. Several quick pauses or occasional prolonged pauses may occur.
3.  **Level 3: Very complex**
    *   Original Definition: Vocabulary that is often complex: unfamiliar, archaic, subject-specific, and/or overly academic
    *   Summary definition: Overall, vocabulary often presents challenges that may slow down comprehension but does not completely block the comprehension of the bulk of the text.
4.  **Level 4: Exceedingly complex**
    *   Original Definition: Vocabulary that is mostly complex: unfamiliar, archaic, subject-specific, and/or overly academic. May be ambiguous or purposefully misleading.
    *   Summary definition: Overall, vocabulary is so complex that it makes comprehension of the bulk of the text very challenging and requires careful effort to interpret.

**Resource 2: Flesch-Kincaid Grade Level**
Use the Flesch-Kincaid (FK) Grade Level as light guidance of the approximate grade level based on readability. The metric alone does not provide final information of vocabulary complexity, but a ballpark of the difficulty of the entire text.
*   grade 2-3: 1.98-5.34
*   grade 4-5: 4.51-7.73
*   grade 6-8: 6.51-10.34
*   grade 9-10: 8.32-12.12
*   grade 11-12: 10.34-14.2

**Guidelines for Interpretation and Reasoning**

Your reasoning is the most critical part of your analysis. It's not enough to simply count complex words. You must analyze their impact on a student at the specified grade level. Use the following principles to guide your judgment:

1.  **Density and Cumulative Effect:** Do not just count complex words; evaluate their concentration. A short text with a high density of challenging Tier 2 words (e.g., `peculiar`, `mischievous`, `courageous` for a 4th grader) can be more overwhelming than a longer text with a few scattered Tier 3 words. A constant barrage of unfamiliar words can elevate complexity from `very` to `exceedingly`.
2.  **Contextual Scaffolding:** Assess how the text supports new vocabulary.
    *   Are new, complex terms explicitly defined or explained with simple examples (e.g., "volume... to see if it is big enough to hold a liter of food")?
    *   Is the surrounding language simple and conversational, making the meaning of new words easier to infer?
    *   Strong scaffolding can lower the complexity rating. A text with many Tier 3 words that are well-explained might only be `moderately complex`.
3.  **Abstract vs. Concrete Vocabulary:** Differentiate between words for abstract concepts and words for concrete things. A text built on abstract Tier 2 words (e.g., `relationships`, `performance`, `non-physical`) can be more challenging than a text that introduces Tier 3 labels for concrete things or people (e.g., `Sumerians`, `polonium`).
4.  **Conceptual Load:** Consider the cognitive load of the vocabulary. A list of many new, multi-syllabic, conceptually-heavy terms (e.g., `Paleolithic`, `Mesolithic`, `Neolithic` for a 3rd grader) can be `very complex` even if the terms are briefly defined, because the student must process multiple new concepts at once.
5.  **Calibrating the Top Levels:** Be precise in your use of `very complex` vs. `exceedingly complex`.
    *   **Very complex:** The vocabulary creates significant hurdles and slows the reader down, but the main ideas of the text are still accessible with effort.
    *   **Exceedingly complex:** The vocabulary is so dense, technical, or abstract that it acts as a barrier, making it nearly impossible for the target student to grasp the bulk of the text's meaning without extensive outside help. Reserve this for texts saturated with advanced terminology.
6.  **Consider Background Knowledge:** Pay close attention to the provided `student_background_knowledge`. Do not classify a word as complex if the student is likely to be familiar with it (e.g., 'oxygen' for a 3rd grader who has learned about the human body).

**Final Analysis Format**

Provide these information as your final analysis:
1.  **Complex vocabulary:**
    *   Tier 2 words: Words that are commonly used in academic settings and more complex than colloquial, or everyday language and often have multiple meanings.
    *   Tier 3 words: Overly academic or domain-specific words.
    *   Archaic words: Words, or uses of words that are not commonly used in modern conversational language. E.g., "The jury retired to deliberate on their verdict." The use of "retire" to mean withdrawing to a private place is an archaic use.
    *   Other complex words: All other words that can increase complexity of the text (e.g., idioms, unfamiliar proper nouns that function as vocabulary).
2.  **Vocabulary complexity:** one of: slightly complex, moderately complex, very complex, exceedingly complex
3.  **Your reasoning of the complexity:** A detailed explanation of your rating, referencing the principles above.
