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Canonical Gymnasium Mathematics: Sek I Data / Chance Audit

Snapshot: 2026-04-05

Purpose:

  • review the current canonical Sek I Daten / Zufall inventory before more bundeslandwise widening
  • use already reviewed HB and HH Sek-I evidence to test whether the current canonical cuts are pedagogically stable
  • define the next canonical work packages for Sek I Daten / Zufall

Scope

In scope:

  • the canonical Sek-I data/chance topic surface in
  • curricula/DE/Gymnasium/canonical/DE_DEU_S_GYM_CANONICAL_MATHEMATIK.de.json
  • the already reviewed lower-secondary source and mapping evidence from
  • HB
  • HH
  • MV
  • SH
  • RP
  • SN
  • ST

Out of scope:

  • full bundesland completion
  • direct canonical JSON refactoring in this step
  • learner-facing composition views

Reviewed source evidence

Hamburg (HH)

Reviewed lower-secondary source anchors exist in three bands:

  1. J6 Daten und Zufall
  2. J8 Daten und Zufall
  3. J10 Daten und Zufall

Observed signal:

  • HH confirms that data/chance is a stable, visible lane across the whole Sek-I progression
  • current reviewed HH evidence is still broad; it is strong enough for package validation, but not yet for fine atomic forcing

Schleswig-Holstein (SH)

Reviewed lower-secondary source and mapping evidence is now explicit enough for package validation:

  1. Jahrgangsband 5/6: Daten und Zufall
  2. statistische Erhebungen
  3. kombinatorische Fragestellungen
  4. einstufige Zufallsexperimente

  5. Jahrgangsband 7/8/9: Daten und Zufall

  6. Haeufigkeit
  7. Wahrscheinlichkeit
  8. mehrstufige Zufallsexperimente
  9. beschreibende Statistik
  10. Spannweite, Quartile und Boxplots
  11. Datenverteilungen vergleichen und deuten

Observed signal:

  • SH validates that D4 is not just an appendix to general probability work, but a visible later Sek-I package of its own
  • SH also stabilizes the split between D2, D3, and D4 more clearly than HB and HH alone
  • the early 5/6 lane still keeps combinatorics adjacent to first data/chance work, so D5 should remain an explicit open decision rather than being silently absorbed

Bremen (HB)

Reviewed lower-secondary data/chance corridors already exist as broad strips:

  1. J5/6 Stochastik
  2. lists
  3. diagrams
  4. means
  5. first random experiments

  6. J7/8 Stochastik

  7. distributions
  8. Laplace
  9. two-stage random experiments

  10. J9 Stochastik

  11. combinatorics
  12. four-field tables

Observed signal:

  • HB supports a progression from early data routines toward probability models and then toward structured multi-step and conditional settings
  • HB strongly suggests that combinatorics / four-field-table work should not be hidden inside a diffuse broad statistics package

Sachsen (SN)

Reviewed lower-secondary source and mapping evidence is now explicit in three later Sek-I lanes:

  1. K8 Lernbereich 2 Zufallsversuche
  2. Ereignisse und Laplace-Wahrscheinlichkeiten
  3. Baumdiagramme
  4. Simulationen
  5. Abzaehlprobleme

  6. K10 Lernbereich 2 Diskrete Zufallsgroessen

  7. Wahrscheinlichkeitsverteilungen
  8. Stabdiagramme und Histogramme
  9. Wahrscheinlichkeiten mit genau/mindestens/hoechstens k
  10. Pfadregeln und Abzaehlverfahren
  11. Verteilungsfunktion
  12. Erwartungswert, Varianz, Standardabweichung
  13. faire und unfaire Spiele

  14. K9 Lernbereich 4 Auswerten von Daten

  15. Modalwert, Median, arithmetisches Mittel
  16. Spannweite, Varianz, Standardabweichung
  17. Klassenbildung und Histogramme
  18. typische Fehler und Manipulationen in der Statistik

Observed signal:

  • SN now also confirms the existing D2, D3, and D5 surfaces with an explicit K8 chance-experiment strip
  • SN adds a real later Sek-I random-variable strip on top of the already frozen D1-D5 surface
  • SN now also adds a real later descriptive-statistics strip that sits cleanly on the existing D4 surface
  • SN now also adds an earlier K7 data-display strip that still fits the same broad D4 surface
  • the Sachsen K10 strip is still internally mixed between later probability structure, counting bridge, and descriptive-statistics adjacency
  • the Sachsen K8 strip is internally mixed between first Laplace work, tree structures, simulation, and counting
  • the Sachsen K9 strip is internally mixed between descriptive-statistics routine, histogram work, and critical-reading residue
  • the Sachsen K7 strip is internally mixed between diagram forms and first critical reading of statistical data
  • together this is strong enough for reviewed corridor mappings, but still not clean enough to force a separate visible canonical D6 package for discrete random variables or a separate visible critical-statistics package

Sachsen-Anhalt (ST)

Observed signal:

  • ST now contributes a first reviewed early lower-secondary data lane through JG 5/6
  • the lane is still broad and splits only into data-display work and measures-of-data work
  • both strips fit the existing descriptive-statistics surface
  • this confirms that early Sachsen-Anhalt data work does not currently force a separate visible early diagram-reading or measures package

Mecklenburg-Vorpommern (MV)

Observed signal:

  • MV now contributes a first reviewed early lower-secondary data/chance corridor on the explicit Klassen 5/6 lane
  • the Mecklenburg-Vorpommern source separates
  • Statistische Erhebungen
  • einstufige Zufallsexperimente
  • this makes MV a useful pressure test for whether the visible early data/chance surface can absorb both survey/display work and first Laplace-style probability work without forcing a separate early diagram or early-probability package
  • MV now contributes a first reviewed lower-secondary data/chance corridor on the explicit Klasse 9 lane
  • the Mecklenburg-Vorpommern source separates
  • Haeufigkeiten, Mittelwerte und Streumasse
  • statistische Erhebungen
  • this makes MV a useful pressure test for whether the visible D4 descriptive-statistics surface can absorb both summary measures and survey-design/evaluation residue without forcing a separate survey or critical-statistics package
  • MV now also contributes a first reviewed later-probability corridor on the explicit Klasse 10 lane
  • the Mecklenburg-Vorpommern source separates
  • Zufallsexperimente mit und ohne Zuruecklegen
  • Zufallsgroessen und Binomialverteilung
  • this confirms that the visible D3 surface can coexist with the frozen broad D1-D5 surface for later random-variable residue without forcing a separate visible D6 package

Thueringen (TH)

Observed signal:

  • TH now contributes a first reviewed lower-secondary data/chance corridor on the explicit Klassenstufen 5/6 lane
  • the Thueringen source separates
  • Daten erfassen und darstellen
  • statistische Kenngroessen und mit Zufall experimentieren
  • this makes TH a useful pressure test for whether the early data surface can coexist with a still-mixed early statistics/chance strip on the broad Sek-I data/chance surface without forcing either a separate early diagram package or a separate early-probability package
  • TH now also contributes a first reviewed broad Klassenstufen 7/8 data/chance corridor
  • the archived 7/8 source still exposes only one shared Stochastik strip
  • this confirms that the shared broad Sek-I data/chance surface can absorb a reviewed wide 7/8 lane without forcing a sharper canonical split from source granularity alone
  • TH now also contributes a first reviewed broad Klassenstufen 9/10 data/chance corridor
  • the archived 9/10 source still exposes only one shared Stochastik strip
  • this confirms that the same shared broad later Sek-I data/chance surface can absorb a reviewed wide 9/10 lane without forcing a sharper canonical split from source granularity alone

Current canonical data/chance inventory

The canonical graph is already materially seeded here.

Important existing package handles:

  1. early package
  2. Fruehe Daten-, Zufalls- und Zaehlvorstellungen (Sek I)

  3. later package

  4. Spaetere Daten-, Wahrscheinlichkeits- und Statistikvorstellungen (Sek I)

  5. descriptive-statistics package

  6. Kenngroessen von Daten bestimmen und interpretieren
  7. Beschreibende Statistik mit Quartilen, Boxplots und Verteilungen (Sek I)

  8. probability / experiment packages

  9. Laplace-Wahrscheinlichkeiten und relative Haeufigkeiten
  10. Zusammengesetzte Zufallsexperimente modellieren und simulieren
  11. atoms for Baumdiagramme, Pfadregeln, simulation

  12. top-level package

  13. Daten und Zufall (Sek I)

Audit judgment

The canonical data/chance topic is not missing a foundation. The main packaging decision is now materially stabilized: HB, HH, and especially SH support D1-D4 as a workable nationwide cut.

Main problem:

  • the current top-level topic mixes
  • early data routines,
  • later probability,
  • multi-stage experiment structure,
  • and descriptive statistics without exposing the package boundaries clearly enough for state-by-state validation

This is therefore primarily a packaging-and-cut problem, not first a missing-content problem.

Findings

1. Early data routines are present but not visibly separated enough from later probability

The canonical graph already has:

  • absolute / relative frequencies
  • diagrams
  • arithmetic mean
  • first random experiments

This is good. But for topic-first steering, these should become a visibly own package:

  • collecting, displaying, and interpreting data
  • first random situations

2. Laplace / relative-frequency work is pedagogically real and should remain explicit

HB J7/8 clearly supports a package around:

  • distributions
  • Laplace
  • first probability reasoning

The canonical graph already contains this material, but it sits partly spread across the early and later mixed package handles.

3. Multi-stage experiments are already a strong canonical unit

This part looks healthier:

  • Zusammengesetzte Zufallsexperimente modellieren und simulieren
  • Baumdiagramme und Pfadregeln
  • simulation

This should stay an explicit later package.

4. Descriptive statistics is present, but its relation to the rest is too implicit

The canonical graph already includes:

  • median
  • quartiles
  • boxplots
  • comparing distributions

That is strong. But at the package level it is still not clear enough whether descriptive statistics is:

  • just an appendix to probability
  • or a full own later Sek-I subpackage

The reviewed state evidence points to the second reading.

5. Combinatorics / four-field-table work deserves an explicit decision

HB J9 gives an important signal:

  • combinatorics
  • four-field tables

This does not yet force a large new canonical wave, but it does require a packaging decision:

  • either these stay inside the multi-stage / conditional package
  • or they become a visible subpackage of later probability structure

That decision should be made explicitly, not by drift.

Proposed canonical work packages

For Sek I Daten / Zufall, use these work packages:

  1. D1 Early data routines and first random experiments
  2. collecting data
  3. tables / diagrams
  4. absolute / relative frequencies
  5. arithmetic mean
  6. first simple random situations

  7. D2 Laplace ideas and probability from frequencies

  8. probability notions
  9. relative frequency as empirical bridge
  10. Laplace settings

  11. D3 Multi-stage experiments, tree diagrams, conditional structure

  12. tree diagrams
  13. path rules
  14. simulations
  15. four-field-table adjacency

  16. D4 Descriptive statistics and data comparison

  17. median
  18. quartiles
  19. boxplots
  20. compare distributions

  21. D5 Combinatorics / structured counting bridge

  22. only if the reviewed state evidence shows this repeatedly enough
  23. otherwise keep it attached to D3

Recommendation

Do not widen more bundesland mappings on Sek-I data/chance before one canonical pass answers these questions:

  1. Should D1 become a clearly visible own canonical subcluster?
  2. Should D4 descriptive statistics become a more explicit later subcluster?
  3. Should combinatorics / four-field-table work remain inside D3, or should there be a visible D5 bridge package?

Run one canonical design step only on:

Sachsen K10 random-variable and K9 descriptive-statistics corridors connected (2026-04-03)

  • SN K10 Lernbereich 2 Diskrete Zufallsgroessen now points to the broad visible Daten und Zufall (Sek I) surface
  • the split Sachsen source strips there now separate
  • distributions of discrete random variables,
  • event probabilities with path rules / counting procedures / distribution function,
  • expected value / variance / standard deviation / fair games
  • SN K9 Lernbereich 4 Auswerten von Daten now also points to the visible D4 descriptive-statistics surface
  • SN K7 Lernbereich 4 Vernetzung: Darstellen von Daten now also points to the visible D4 descriptive-statistics surface
  • the split Sachsen source strips there now separate
  • Lageparameter,
  • Streuungsmasse und Histogramme,
  • kritische Beurteilung statistischer Darstellungen
  • the earlier Sachsen K7 strip intentionally stays broad on the same D4 surface instead of forcing a separate visible diagram-reading package
  • the later probability strips intentionally stay on broad existing D3 and D4-adjacent package targets
  • the later descriptive-statistics strips intentionally stay on broad existing D4 targets instead of forcing a new visible histogram or manipulation package
  • together this confirms reviewed late-Sek-I residue, but still does not justify a new visible canonical random-variable package beyond D1-D5

  • D1 Early data routines and first random experiments

  • D2 Laplace ideas and probability from frequencies
  • D3 Multi-stage experiments, tree diagrams, conditional structure
  • D4 Descriptive statistics and data comparison

Why this cut:

  • HB and HH already provide enough reviewed evidence for the broad progression
  • the package decision matters more right now than adding lots of new atoms
  • it keeps combinatorics / four-field-table work open as an explicit follow-up decision instead of forcing it too early

Exit criteria for this audit

This topic audit is complete when:

  1. the canonical subpackage boundaries above are either accepted or revised
  2. the canonical graph has a stable Sek-I data/chance packaging
  3. reviewed HB and HH evidence can be described as aligned to the revised packaging or intentionally broader because of source granularity
  4. it is clear whether combinatorics / four-field-table work stays inside D3 or deserves a visible D5 package
  5. at least one reviewed third-state lane beyond HB and HH confirms whether D4 really behaves like an explicit later package

Design step executed (2026-04-01)

The canonical packaging step for Sek I Daten / Zufall is now executed.

Accepted package cut:

  1. D1 = Fruehe Datenroutinen, Haeufigkeiten und Datendeutung (Sek I)
  2. D2 = Laplace-Vorstellungen und Wahrscheinlichkeit aus Haeufigkeiten (Sek I)
  3. D3 = Mehrstufige Zufallsexperimente, Baumdiagramme und bedingte Struktur (Sek I)
  4. D4 = Beschreibende Statistik und Datenvergleich (Sek I)

What changed in the canonical decision:

  • the broad mixed J6 Prozentrechnung und Daten corridor is no longer pulled wholesale into the top-level data/chance package
  • instead, the data-facing early atoms now sit in an explicit D1 package
  • D2 is now a visible probability bridge from frequencies to Laplace settings
  • D3 explicitly carries tree diagrams, simulation, and for now also the adjacency to combined events / four-field structures
  • D4 is now an explicit descriptive-statistics package instead of an implicit appendix

Explicit non-decision kept open:

  • D5 (Zaehlen / Kombinatorik as its own visible package) is still intentionally open
  • reviewed HB J9 evidence is strong enough to keep that question alive, but not yet strong enough to force a separate package in this step

Resulting next step:

  1. realign reviewed HB and HH lower-secondary data/chance mappings to D1-D4
  2. only after that decide whether later reviewed state evidence forces an explicit D5

Third-state validation executed (2026-04-01)

SH now serves as the first external validation lane beyond HB and HH.

What SH confirms:

  1. D1 remains a legitimate early package, even when simple combinatorics sits adjacent to first data/chance work
  2. D2 and D3 can stay separated from later descriptive-statistics work
  3. D4 is pedagogically real as a visible later package because the source lane exposes
  4. beschreibende Statistik
  5. Spannweite, Quartile und Boxplots
  6. Datenverteilungen vergleichen und deuten

Resulting topic status:

  • D1-D4 are now not only canonical design decisions but also externally validated by a third reviewed state lane
  • the last package decision D5 (Zaehlen / Kombinatorik as a separate visible bridge) is now executed

Recommended next step after this validation:

  1. treat Sek I Daten / Zufall as canonically stable enough to freeze further package churn
  2. use additional state lanes only for mapping and residue control, not to reopen the D1-D5 cut without strong contrary evidence

D5 decision executed (2026-04-01)

The open D5 question is now resolved in favour of a visible package.

Why this decision is now justified:

  • HB contributes a reviewed later Sek-I signal via J9 Stochastik: Kombinatorik und Vierfeldertafeln
  • SH keeps combinatorial questions explicitly adjacent to early data/chance work in Jahrgangsband 5/6
  • the Hessen lower-secondary source lane contributes an explicit later atom Abzaehlstrategien nutzen with direct probability use

Canonical consequence:

  1. D5 is now visible as Zaehlen, Kombinatorik und Wahrscheinlichkeitsbruecken (Sek I)
  2. the package currently bundles
  3. the existing early atom for simple counting principles
  4. one later bridge atom for combinatorial reasoning in probability situations
  5. D3 keeps four-field tables, conditional structure, and multi-step random experiments
  6. D5 does not absorb those D3 structures; it stays a counting/probability bridge

Result:

  • Sek I Daten / Zufall now has a stable visible D1-D5 package surface
  • the topic should now be treated as materially packaged, with later work focused on mapping quality rather than package invention

Sachsen-Anhalt JG 5/6 data corridor connected (2026-04-03)

  • the ST JG 5/6 strips Erfassen, Darstellen und Auswerten von Daten and Kenngroessen von Daten now both point to the existing descriptive-statistics surface
  • the reviewed ST lane therefore confirms the broad early D4 packaging without reopening the current Sek-I data/chance cut

Sachsen-Anhalt JG 7/8 chance corridor connected (2026-04-03)

  • the ST JG 7/8 strip Zufaellige Ereignisse, Haeufigkeiten, Wahrscheinlichkeiten now points to the existing Laplace / frequency bridge
  • the ST JG 7/8 strip Mehrstufige Zufallsversuche und Wahrscheinlichkeiten now points to the visible multi-step random-experiment surface
  • the reviewed ST lane therefore confirms the current D2/D3 split without forcing a new mixed early-probability package

Sachsen-Anhalt JG 10 random-variables corridor connected (2026-04-03)

  • the ST JG10 strip Zufallsgroessen now points to the broad visible Daten und Zufall (Sek I) surface
  • the reviewed ST lane therefore confirms that later Sek-I random-variable residue can stay on the frozen D1-D5 package surface without forcing a separate visible D6 package

Sachsen-Anhalt JG 9 frequency-distributions corridor connected (2026-04-03)

  • the ST JG9 strip Haeufigkeitsverteilungen now points to the visible D4 descriptive-statistics surface
  • the reviewed ST lane therefore confirms that later Sek-I distribution-comparison residue can stay on the frozen descriptive-statistics package without forcing a separate visible histogram or frequency-distribution package

Rheinland-Pfalz Klassenstufen 9 und 10 data/chance corridor connected (2026-04-03)

  • the broad RP Klassenstufen 9 und 10: Daten und Zufall anchor now carries a reviewed split into Vierfeldertafeln, zweistufige Zufallsexperimente and Wahrscheinlichkeiten durch Simulationen
  • the first strip points to the visible multi-stage-experiment surface
  • the second strip points to the visible probability-from-frequencies bridge
  • the RP lane therefore confirms the visible Sek-I chance surface without forcing a new visible later random-variable package

Saarland Klassenstufe 7 data/chance corridor connected (2026-04-04)

  • the broad SL Klassenstufe 7: Daten und Zufall anchor now carries a first reviewed corridor on the shared Sek-I data/chance surface
  • the current Saarland grade-7 source still exposes only one shared data/chance strip
  • this confirms that the shared broad Sek-I data/chance surface can absorb an explicit reviewed class-7 lane without forcing a sharper state-local split from source granularity alone

Saarland Klassenstufe 8 data/chance corridor connected (2026-04-04)

  • the broad SL Klassenstufe 8: Daten und Zufall anchor now carries a first reviewed corridor on the shared Sek-I data/chance surface
  • the current Saarland grade-8 source still exposes only one shared data/chance strip
  • this confirms the shared broad Sek-I data/chance surface can absorb an explicit reviewed class-8 lane without forcing a sharper state-local split

Saarland Klassenstufe 9 data/chance corridor connected (2026-04-04)

  • the broad SL Klassenstufe 9: Daten und Zufall anchor now carries a first reviewed corridor on the shared Sek-I data/chance surface
  • the current Saarland grade-9 source still exposes only one shared data/chance strip
  • this confirms the shared broad Sek-I data/chance surface can absorb an explicit reviewed class-9 lane without forcing a sharper state-local split

Saarland Klassenstufe 10 data/chance corridor connected (2026-04-04)

  • the broad SL Klassenstufe 10: Daten und Zufall anchor now carries a first reviewed corridor on the shared Sek-I data/chance surface
  • the current Saarland grade-10 source still exposes only one shared data/chance strip
  • this confirms the shared Sek-I data/chance surface can absorb an explicit reviewed grade-10 lane without forcing a sharper state-local split

Additional reviewed nationwide evidence (BW, BY, SH)

Baden-Wuerttemberg (BW)

Observed signal:

  • the reviewed Baden-Wuerttemberg lower-secondary lane already carries explicit 3.1.5, 3.2.5, and 3.3.5 widening steps on the shared Sek-I data/chance spine
  • 3.1.5 Daten und Zufall now bridges reviewed early data leaves for frequencies, arithmetic mean, and critical diagram reading
  • 3.2.5 Daten und Zufall now bridges reviewed later descriptive-statistics and Laplace work
  • 3.3.5 Daten und Zufall now bridges reviewed later conditional-probability, four-field, stochastic-independence, random-variable, and binomial surfaces
  • together this confirms that the visible D1-D5 surface can absorb the Baden-Wuerttemberg lane without forcing another package split

Bayern (BY)

Observed signal:

  • the reviewed Bavaria retained gymnasium lane now already reaches the visible Sek-I data/chance surface across M5-M10
  • the active BY mappings now cover simple counting, frequencies, arithmetic mean, descriptive statistics with quartiles and boxplots, Laplace situations, linked events with Vierfelderstrukturen, tree diagrams, simulation, and conditional-structure work
  • together this keeps Bavaria on the current D1-D5 package surface instead of forcing a new nationwide data/chance pass

Schleswig-Holstein (SH)

Observed signal:

  • Schleswig-Holstein no longer only serves as the original third-state validation lane; the lower-secondary source snapshot is now fully refined across 5/6 and 7/8/9 on Daten und Zufall
  • the active SH mappings now cover early statistical surveys, simple combinatorics, one-stage random experiments, frequencies, probability, multi-stage random experiments, quartiles / boxplots, and data-comparison work
  • there are now no remaining unmapped SH Sek-I source atoms or source clusters in the active data/chance-owning lane; the remaining mismatch is broad-source residue, not a missing canonical package

Nordrhein-Westfalen lower-secondary data/chance corridor connected (2026-04-05)

Observed signal:

  • the active Nordrhein-Westfalen lower-secondary source snapshot now also carries explicit reviewed data/chance corridors from 2.3, 2.4.1, and 2.4.2
  • the mapped NRW lower-secondary lane now covers early statistical data collection and representation, first measures of data, one- and two-stage random experiments, Laplace-based probability, simulation, critical reading of statistical representations, conditional probability, stochastic independence, and combinatorics
  • the compiled canonical applicability now keeps DE-NW on the shared Daten und Zufall (Sek I) root together with the visible D1, D2, D3, D4, and D5 package handles
  • the Nordrhein-Westfalen data/chance cell can therefore now be treated as resolved on topic level

Berlin / Brandenburg lower-secondary data/chance corridors connected (2026-04-05)

Observed signal:

  • the active shared BE/BB lower-secondary source snapshots now also carry explicit reviewed data/chance corridors from the Sek-I Daten und Zufall surface on Niveaustufen E-H
  • the mapped Berlin and Brandenburg lower-secondary lanes now cover statistical surveys and samples, diagram work with frequencies and simple data measures, boxplots / histograms / descriptive-statistics reading, survey critique and manipulation detection, Laplace-oriented probability reasoning, tree/vierfelder-based conditional structure, and explicit combinatorial probability bridges
  • the compiled canonical applicability can therefore keep both DE-BE and DE-BB on the shared Daten und Zufall (Sek I) root together with the visible D1, D2, D3, D4, and D5 package handles
  • the Berlin and Brandenburg data/chance cells can therefore now be treated as resolved on topic level

Niedersachsen lower-secondary data/chance corridor connected (2026-04-05)

Observed signal:

  • the active Niedersachsen lower-secondary source snapshot now also carries an explicit reviewed data/chance corridor from the five real Lernbereiche Planung und Durchfuehrung statistischer Erhebungen, Masszahlen statistischer Erhebungen, Wahrscheinlichkeit, Ein- und mehrstufige Zufallsversuche, and Baumdiagramme und Vierfeldertafeln
  • the mapped Niedersachsen lower-secondary lane now covers survey planning and data preparation, chart/frequency work, simple descriptive-statistics measures, probability as a model of relative frequencies, Laplace reasoning, simulation, multi-stage tree-diagram work, and vierfelder-linked-event interpretation
  • the compiled canonical applicability can therefore keep DE-NI on the shared Daten und Zufall (Sek I) root together with the visible D1, D2, D3, and D4 package handles, while the NI source still does not force a separate new canonical package beyond the frozen D1-D5 cut
  • the Niedersachsen data/chance cell can therefore now be treated as resolved on topic level

Coverage checkpoint (2026-04-05)

  • NI now joins BE, BB, BW, BY, NW, and SH together with the already reviewed HB, HH, HE, MV, RP, SL, SN, ST, and TH lanes as resolved against the frozen D1-D5 package surface
  • the nationwide data/chance row is therefore fully resolved once across all 16 states and is no longer blocked by package design or by state-lane breadth debt
  • the next nationwide math move should therefore no longer be another Sek-I data/chance sweep; it should shift to applicability, learner-facing scope stabilization, and the broader P6/F6 cutover work