Two.Sigma

← Review lab

Run #757

done rubric v1 session 79402437 gemini-3.7-flash 2026-09-21 02:21
Session in Sessions →

The recording

What the student sent the question as it arrived, then each reading of it

Typed by the student

Oxidation number

The audit's reading of the question, which is what the Product AI judged against:

Oxidation number

Audit's summary: The student asked about oxidation numbers. The tutor explained that the number written above an element is its oxidation number, representing the number of electrons it needs to gain or lose. The tutor used examples with "O" and "f" and stick figures to illustrate positive and negative oxidation numbers. The tutor also wrote "Nacl" on the board.

Transcript 532 characters

Read it no speaker labels — tutor and student run together

Hello, good afternoon. Hello. Hello. Hello ma'am, good afternoon. Yes, I can hear you. Yes, I can hear you. You have to understand the oxidation number. How do you get the oxidation number? Oxidation number has a little problem. Please understand it well. Beware of the following words . इसकी ओक्सिडेशन नंबर आपके यहाँ पे होगी, माइटस वर्ष है. जो उपर जो नंबर लिखा होता है न, इसको बोलते है बन ओक्सिडेशन नंबर है. या इसको कितने इलेक्रों की कभी है या कितने इलेक्रों इसको देने है, न ऐसा. सबसे आया? इसकी पैसा क्या होगी? इसकी पैसा क्या होगी?

What the student sent the question as it arrived, then each reading of it

Typed by the student

Oxidation number

The audit's reading of the question, which is what the Product AI judged against:

Oxidation number

Audit's summary: The student asked about oxidation numbers. The tutor explained that the number written above an element is its oxidation number, representing the number of electrons it needs to gain or lose. The tutor used examples with "O" and "f" and stick figures to illustrate positive and negative oxidation numbers. The tutor also wrote "Nacl" on the board.

Transcript 532 characters

Read it no speaker labels — tutor and student run together

Hello, good afternoon. Hello. Hello. Hello ma'am, good afternoon. Yes, I can hear you. Yes, I can hear you. You have to understand the oxidation number. How do you get the oxidation number? Oxidation number has a little problem. Please understand it well. Beware of the following words . इसकी ओक्सिडेशन नंबर आपके यहाँ पे होगी, माइटस वर्ष है. जो उपर जो नंबर लिखा होता है न, इसको बोलते है बन ओक्सिडेशन नंबर है. या इसको कितने इलेक्रों की कभी है या कितने इलेक्रों इसको देने है, न ऐसा. सबसे आया? इसकी पैसा क्या होगी? इसकी पैसा क्या होगी?

Review team

no_issue

Product AI

nothing found

teaching Yes · mistakes No · satisfactory Yes

Each verdict takes your own. Yours is stored against the stack's, so “where is it wrong most often” is a question with an answer.

  1. Work is the right way up The canvas is upright at 0 degrees.
    Text and drawings in Frames 1-8 are oriented at 0 degrees.
    seen · 100% confident
  2. Your view
  3. Writing is legible at video size Text and handwritten annotations are clear and legible.
    Frames 1-8 show clearly written text, labels (+2, -1, O, F), and distinct color-coded stick figures.
    seen · 95% confident
  4. Your view
  5. The work fills the frame Not applicable to a board session
    seen
  6. Nothing distracting in shot Not applicable to a board session
    seen
  7. The student's problem is established Only the general topic is stated rather than a specific problem.
    Frame 1 shows the topic card 'Oxidation number', but no specific question text or compound problem is displayed.
    seen · 85% confident
  8. Your view
  9. Work proceeds in followable steps Visual aids and annotations accumulate in an orderly fashion.
    Frames 2 to 8 progressively build a diagrammatic explanation using stick figures to represent oxidation states.
    seen · 90% confident
  10. Your view
  11. It reaches an answer The conceptual explanation is brought to a completed visual state.
    By Frame 8, both elements and their corresponding visual representations are fully annotated and enclosed.
    seen · 85% confident
  12. Your view
  13. Something was actually written board went from 1.91% to a peak of 7.41% covered (+5.50 points), ending at 7.41%
    measured
  14. Your view
  15. The concept is named before the working The tutor explicitly names the concept at the start.
    The tutor states: 'You have to understand the oxidation number' and the board displays 'Oxidation number' in Frame 1.
    heard · 95% confident
  16. Your view
  17. Explained rather than jumped to the answer The tutor focuses entirely on explaining the fundamental concept.
    From Frames 2 through 8, the tutor uses conceptual examples and stick-figure analogies to explain oxidation states before solving complex examples.
    heard · 90% confident
  18. Your view
  19. Solved step by step, not in one leap The explanation unfolds gradually with intuitive visual steps.
    Frames 2-8 show elements written first, followed by stick figures, charges, and connecting arrows in order.
    heard · 90% confident
  20. Your view
  21. The session opens properly The tutor greeted the student and confirmed the topic.
    Transcript opens with 'Hello, good afternoon' and establishes 'You have to understand the oxidation number.'
    heard · 95% confident
  22. Your view
  23. No long dead air 1 gaps over 6.0s, 8s total (4% of the session), longest 8s
    Silence is below -35.0dB — a crude measure on a phone microphone, so treat a low count as weak evidence rather than proof the tutor was talking.
    measured
  24. Your view
Observations judged, but not counted as the lab objecting
  1. The camera holds still Not applicable to a board session
    Not counted: Measured over 183 known-bad and 29 known-good camera sessions (2026-09-21): raised on 87% of the bad and 86% of the good, and the motion distributions are the same shape — median frame difference 25 on the bad set, 27 on the good. No threshold on this number separates them, so it is reported and not counted.
    measured
  2. Exposure is usable Not applicable to a board session
    Not counted: Same two sets: it raised 6 of 183 known-bad and 2 of 29 known-good sessions. Both too few to mean anything, and the brightness distributions overlap almost exactly. The earlier reading that it 'fires more on clean sessions' was two sessions out of twenty-nine — noise, not an inverted rule.
    measured
  3. Understanding of the concept is checked Check-ins are mostly rhetorical or brief.
    The transcript shows brief check-ins like 'समझ आया?' rather than substantive concept-testing questions.
    Not counted: Raised on 87% of known-bad and 80% of known-good sessions. The criterion is honest about why in its own `why`: the transcript has no speaker labels, so a real check and a rhetorical 'ok?' are often indistinguishable, and the bar ends up one almost no session clears. Still judged and shown, because reading it beside a recording is how it gets better.
    heard
  4. Your view

Measured

Duration200s (3.3 min)
Video1280×800 @ 10.0fps
Audio trackyes
Shot changes
Dead air1 gaps ≥6.0s · 8.0s total · longest 8.0s
Lumaavg 44.6 · min · max
Mediumboard 96.1% flat background
Content written1.91% → 7.41% (+5.5)
Transcript 532 characters of speech
Frames8

What the model returned verbatim

{
  "findings": [
    {"key": "orientation", "verdict": "ok", "headline": "The canvas is upright at 0 degrees.", "evidence": "Text and drawings in Frames 1-8 are oriented at 0 degrees.", "confidence": 1.0},
    {"key": "legibility", "verdict": "ok", "headline": "Text and handwritten annotations are clear and legible.", "evidence": "Frames 1-8 show clearly written text, labels (+2, -1, O, F), and distinct color-coded stick figures.", "confidence": 0.95},
    {"key": "question_captured", "verdict": "weak", "headline": "Only the general topic is stated rather than a specific problem.", "evidence": "Frame 1 shows the topic card 'Oxidation number', but no specific question text or compound problem is displayed.", "confidence": 0.85},
    {"key": "structure", "verdict": "ok", "headline": "Visual aids and annotations accumulate in an orderly fashion.", "evidence": "Frames 2 to 8 progressively build a diagrammatic explanation using stick figures to represent oxidation states.", "confidence": 0.9},
    {"key": "completion", "verdict": "ok", "headline": "The conceptual explanation is brought to a completed visual state.", "evidence": "By Frame 8, both elements and their corresponding visual representations are fully annotated and enclosed.", "confidence": 0.85},
    {"key": "concept_named", "verdict": "ok", "headline": "The tutor explicitly names the concept at the start.", "evidence": "The tutor states: 'You have to understand the oxidation number' and the board displays 'Oxidation number' in Frame 1.", "confidence": 0.95},
    {"key": "explained_before_solving", "verdict": "ok", "headline": "The tutor focuses entirely on explaining the fundamental concept.", "evidence": "From Frames 2 through 8, the tutor uses conceptual examples and stick-figure analogies to explain oxidation states before solving complex examples.", "confidence": 0.9},
    {"key": "concept_checked", "verdict": "weak", "headline": "Check-ins are mostly rhetorical or brief.", "evidence": "The transcript shows brief check-ins like 'समझ आया?' rather than substantive concept-testing questions.", "confidence": 0.8},
    {"key": "step_by_step", "verdict": "ok", "headline": "The explanation unfolds gradually with intuitive visual steps.", "evidence": "Frames 2-8 show elements written first, followed by stick figures, charges, and connecting arrows in order.", "confidence": 0.9},
    {"key": "opening", "verdict": "ok", "headline": "The tutor greeted the student and confirmed the topic.", "evidence": "Transcript opens with 'Hello, good afternoon' and establishes 'You have to understand the oxidation number.'", "confidence": 0.95}
  ]
}

Frames in order, one every ~25s

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