diff --git a/python/functions/datascience/automatic_eda/chapters/calidad.py b/python/functions/datascience/automatic_eda/chapters/calidad.py
new file mode 100644
index 00000000..dcedcf6f
--- /dev/null
+++ b/python/functions/datascience/automatic_eda/chapters/calidad.py
@@ -0,0 +1,266 @@
+"""Data-quality chapter (CALIDAD) for AutomaticEDA.
+
+Builds the quality chapter from a ``TableProfile`` of the ``eda`` group. The
+chapter answers, in Spanish and as tables, the three things the user asked for:
+
+1. **En qué se basa la calidad** — an intro paragraph explaining the criteria and
+   their weights (completeness, validity, consistency) before any number, plus a
+   table-level summary (global score and aggregates).
+2. **Scores por columna** — a table with, per column, the total quality score and
+   its breakdown into completeness / validity / consistency.
+3. **Problemas en español** — a second table listing, per column, the readable
+   issues in Spanish (kept separate from the type ``flags``).
+
+The breakdown and the issues are NOT recomputed here: they come from the registry
+function ``column_quality_score`` (group ``eda``), which already derives
+``{score, completeness, validity, consistency, issues}`` from the ColumnProfile.
+This chapter is render-only — it consumes that function and lays the result out
+as model blocks; the renderers paginate tables (splitting by rows, repeating the
+header) and wrap long cells so nothing is ever cut.
+
+Contract: build_<id>(profile, ctx) -> Chapter | None ; CHAPTER_VERSION = "x.y.z".
+"""
+
+from __future__ import annotations
+
+from .. import model
+
+# Reuse the registry's pure quality function (group ``eda``). Import defensively:
+# if the package cannot be imported for any reason the chapter degrades to the
+# per-column ``quality_score`` already present in the profile instead of failing.
+try:  # pragma: no cover - import wiring
+    from ...column_quality_score import column_quality_score as _column_quality_score
+except Exception:  # noqa: BLE001 - never let an import error abort the document.
+    _column_quality_score = None
+
+CHAPTER_VERSION = "1.0.0"
+CHAPTER_ID = "calidad"
+CHAPTER_TITLE = "Calidad"
+
+# Weights mirror column_quality_score: completeness 0.5, validity 0.3,
+# consistency 0.2. Kept here only to render the human explanation; the actual
+# numbers always come from the function so the two never drift in computation.
+_CRITERIA_INTRO = (
+    "La calidad de cada columna es un score de 0 a 100 que combina tres "
+    "criterios, cada uno con un peso:\n\n"
+    "- **Completitud (peso 50%)**: proporción de valores presentes (sin nulos "
+    "ni vacíos). Una columna con muchos nulos baja de score.\n"
+    "- **Validez (peso 30%)**: los valores son coherentes con su tipo y rango "
+    "esperado (penaliza outliers y semánticas declaradas que no coinciden).\n"
+    "- **Consistencia (peso 20%)**: la columna aporta información útil (penaliza "
+    "columnas constantes o identificadores de cardinalidad muy alta).\n\n"
+    "Score = 100 × (0,5·completitud + 0,3·validez + 0,2·consistencia). "
+    "Los problemas detectados por columna se listan en español más abajo."
+)
+
+# Cap for the joined issues cell so a single row never grows taller than a page;
+# the remainder is summarized as "(+N más)" instead of being silently dropped.
+_ISSUES_MAXLEN = 160
+
+
+def _fmt_score(value) -> str:
+    """Format a 0-100 score as ``NN / 100`` (or a placeholder)."""
+    if value is None:
+        return "—"
+    try:
+        num = float(value)
+    except (TypeError, ValueError):
+        return str(value)
+    if num != num:  # NaN
+        return "—"
+    text = f"{num:.1f}".rstrip("0").rstrip(".")
+    return f"{text} / 100"
+
+
+def _fmt_unit_pct(value) -> str:
+    """Format a 0-1 fraction as a percentage (``95%``)."""
+    if value is None:
+        return "—"
+    try:
+        return f"{float(value) * 100:.0f}%"
+    except (TypeError, ValueError):
+        return str(value)
+
+
+def _quality_of(col: dict) -> dict:
+    """Return ``{score, completeness, validity, consistency, issues}`` for a column.
+
+    Uses the registry ``column_quality_score`` when available; otherwise falls
+    back to the per-column ``quality_score`` already in the profile (number only,
+    empty breakdown/issues). Never raises.
+    """
+    if not isinstance(col, dict):
+        col = {}
+    if _column_quality_score is not None:
+        try:
+            res = _column_quality_score(col)
+            if isinstance(res, dict):
+                return res
+        except Exception:  # noqa: BLE001 - degrade instead of aborting.
+            pass
+    # Fallback: only the final score is available pre-computed in the profile.
+    return {
+        "score": col.get("quality_score"),
+        "completeness": None,
+        "validity": None,
+        "consistency": None,
+        "issues": [],
+    }
+
+
+def _join_issues(issues) -> str:
+    """Join Spanish issue strings into one cell, truncating overly long lists.
+
+    The renderer wraps cell text, but a column with many long issues could make a
+    single row taller than a whole page; cap the length and append ``(+N más)``
+    so the count of hidden issues is honest rather than silently lost.
+    """
+    if not isinstance(issues, (list, tuple)) or not issues:
+        return ""
+    parts = [model._safe_str(i).strip() for i in issues]
+    parts = [p for p in parts if p]
+    if not parts:
+        return ""
+    out = []
+    used = 0
+    for idx, part in enumerate(parts):
+        extra = len(part) + (2 if out else 0)
+        if used + extra > _ISSUES_MAXLEN and out:
+            remaining = len(parts) - idx
+            out.append(f"(+{remaining} más)")
+            return "; ".join(out)
+        out.append(part)
+        used += extra
+    return "; ".join(out)
+
+
+def _columns_with_quality(profile: dict):
+    """Yield ``(col, quality_dict)`` for every column dict in the profile."""
+    cols = profile.get("columns") or []
+    for c in cols:
+        if isinstance(c, dict):
+            yield c, _quality_of(c)
+
+
+def _summary_block(profile: dict, evaluated: list):
+    """Table-level KVTable: global score and quality aggregates."""
+    rows = []
+    score = profile.get("quality_score")
+    rows.append(("Calidad global", _fmt_score(score)))
+    rows.append(("Columnas evaluadas", str(len(evaluated))))
+
+    comps = [q.get("completeness") for _, q in evaluated
+             if isinstance(q.get("completeness"), (int, float))]
+    vals = [q.get("validity") for _, q in evaluated
+            if isinstance(q.get("validity"), (int, float))]
+    cons = [q.get("consistency") for _, q in evaluated
+            if isinstance(q.get("consistency"), (int, float))]
+    if comps:
+        rows.append(("Completitud media", _fmt_unit_pct(sum(comps) / len(comps))))
+    if vals:
+        rows.append(("Validez media", _fmt_unit_pct(sum(vals) / len(vals))))
+    if cons:
+        rows.append(("Consistencia media", _fmt_unit_pct(sum(cons) / len(cons))))
+
+    n_problem = sum(1 for _, q in evaluated if q.get("issues"))
+    rows.append(("Columnas con problemas", str(n_problem)))
+
+    # Extra table-wide quality signals already in the profile, when present.
+    dup_pct = profile.get("duplicate_pct")
+    if dup_pct is not None:
+        rows.append(("Filas duplicadas", _fmt_unit_pct_or_pct(dup_pct)))
+    null_cell_pct = profile.get("null_cell_pct")
+    if null_cell_pct is not None:
+        rows.append(("Celdas nulas (global)", _fmt_unit_pct_or_pct(null_cell_pct)))
+    constant_cols = profile.get("constant_cols")
+    if isinstance(constant_cols, (list, tuple)) and constant_cols:
+        rows.append(("Columnas constantes", str(len(constant_cols))))
+    all_null_cols = profile.get("all_null_cols")
+    if isinstance(all_null_cols, (list, tuple)) and all_null_cols:
+        rows.append(("Columnas 100% nulas", str(len(all_null_cols))))
+
+    return model.KVTable(rows=rows, title="Resumen de calidad")
+
+
+def _fmt_unit_pct_or_pct(value) -> str:
+    """Format a value that may be a 0-1 fraction or an already-0-100 percentage."""
+    try:
+        num = float(value)
+    except (TypeError, ValueError):
+        return model._safe_str(value)
+    if num != num:  # NaN
+        return "—"
+    pct = num * 100 if num <= 1.0 else num
+    text = f"{pct:.1f}".rstrip("0").rstrip(".")
+    return f"{text}%"
+
+
+def _scores_block(evaluated: list):
+    """DataTable with per-column score and its three-criteria breakdown."""
+    header = ["Columna", "Calidad", "Completitud", "Validez", "Consistencia"]
+    rows = []
+    # Worst columns first so the reader sees the problems at the top.
+    ordered = sorted(
+        evaluated,
+        key=lambda cq: (cq[1].get("score")
+                        if isinstance(cq[1].get("score"), (int, float)) else 101.0),
+    )
+    for col, q in ordered:
+        rows.append([
+            col.get("name") or "(col)",
+            _fmt_score(q.get("score")),
+            _fmt_unit_pct(q.get("completeness")),
+            _fmt_unit_pct(q.get("validity")),
+            _fmt_unit_pct(q.get("consistency")),
+        ])
+    if not rows:
+        return None
+    return model.DataTable(header=header, rows=rows,
+                           title="Scores de calidad por columna",
+                           note="0 = peor, 100 = mejor; ordenado de peor a mejor")
+
+
+def _issues_block(evaluated: list):
+    """DataTable listing Spanish issues per column, or a Note when there are none."""
+    header = ["Columna", "Problemas detectados (español)"]
+    rows = []
+    for col, q in evaluated:
+        joined = _join_issues(q.get("issues"))
+        if joined:
+            rows.append([col.get("name") or "(col)", joined])
+    if not rows:
+        return model.Note(
+            "No se detectaron problemas de calidad en las columnas evaluadas.")
+    return model.DataTable(header=header, rows=rows,
+                           title="Problemas de calidad por columna")
+
+
+def build_calidad(profile: dict, ctx: dict):
+    """Build the data-quality Chapter, or None if the profile has no columns.
+
+    Reads everything defensively; returns ``None`` when there are no columns to
+    score (the chapter does not apply), and never raises on a malformed profile.
+    """
+    profile = profile or {}
+    if not isinstance(profile, dict):
+        profile = {}
+    ctx = ctx or {}
+
+    evaluated = list(_columns_with_quality(profile))
+    if not evaluated:
+        return None  # no columns to score -> chapter does not apply.
+
+    blocks = [
+        model.Heading(text="Cómo se calcula la calidad", level=2),
+        model.Markdown(text=_CRITERIA_INTRO),
+        _summary_block(profile, evaluated),
+        model.Heading(text="Scores por columna", level=2),
+    ]
+    scores = _scores_block(evaluated)
+    if scores is not None:
+        blocks.append(scores)
+    blocks.append(model.Heading(text="Problemas detectados", level=2))
+    blocks.append(_issues_block(evaluated))
+
+    return model.Chapter(id=CHAPTER_ID, title=CHAPTER_TITLE,
+                         version=CHAPTER_VERSION, blocks=blocks)
diff --git a/python/functions/datascience/automatic_eda/chapters/calidad_test.py b/python/functions/datascience/automatic_eda/chapters/calidad_test.py
new file mode 100644
index 00000000..3e6bf5f6
--- /dev/null
+++ b/python/functions/datascience/automatic_eda/chapters/calidad_test.py
@@ -0,0 +1,194 @@
+"""Tests for the CALIDAD chapter — DoD: golden + edges + anti-cut.
+
+Self-contained: builds synthetic TableProfiles (no DuckDB) so the suite is fast
+and deterministic. Verifies that the chapter explains the quality criteria, shows
+per-column scores with the completeness/validity/consistency breakdown, lists the
+issues in Spanish (separate from the type flags), returns None when it does not
+apply, and that a wide profile with long names renders to PDF and PPTX without
+cutting any cell text (long content wraps, it is never truncated).
+"""
+
+import os
+import re
+import tempfile
+
+from pypdf import PdfReader
+from pptx import Presentation
+
+from datascience.automatic_eda.chapters.calidad import (
+    build_calidad,
+    CHAPTER_VERSION,
+)
+from datascience.automatic_eda import build_document, render_pdf, render_pptx
+
+
+def _profile() -> dict:
+    """A small profile with one column per quality problem (nulls, outliers,
+    constant, high-cardinality id) plus one clean column."""
+    return {
+        "table": "demo",
+        "quality_score": 72.5,
+        "duplicate_pct": 0.04,
+        "null_cell_pct": 0.11,
+        "constant_cols": ["flag_const"],
+        "all_null_cols": [],
+        "columns": [
+            {"name": "edad", "inferred_type": "integer", "null_pct": 0.2,
+             "numeric": {"outlier_pct": 0.15, "min": 0, "max": 99},
+             "quality_score": 60},
+            {"name": "nombre", "inferred_type": "text", "null_pct": 0.0,
+             "unique_pct": 0.98, "quality_score": 80},
+            {"name": "flag_const", "inferred_type": "text", "null_pct": 0.0,
+             "flags": ["constant"], "quality_score": 50},
+            {"name": "limpia", "inferred_type": "float", "null_pct": 0.0,
+             "numeric": {"outlier_pct": 0.0}, "quality_score": 100},
+        ],
+    }
+
+
+def _tables(chapter):
+    return [b for b in chapter.blocks if getattr(b, "kind", None) == "data_table"]
+
+
+def _scores_table(chapter):
+    for t in _tables(chapter):
+        if "Scores" in (t.title or ""):
+            return t
+    return None
+
+
+def _issues_table(chapter):
+    for t in _tables(chapter):
+        if "Problemas" in (t.title or ""):
+            return t
+    return None
+
+
+# --------------------------------------------------------------------------- #
+# Golden
+# --------------------------------------------------------------------------- #
+def test_golden_chapter_estructura_y_version():
+    ch = build_calidad(_profile(), {})
+    assert ch is not None
+    assert ch.id == "calidad"
+    assert ch.version == CHAPTER_VERSION
+    kinds = [b.kind for b in ch.blocks]
+    # intro heading + markdown criteria + summary kv + scores table + issues table
+    assert "markdown" in kinds and "kv_table" in kinds and "data_table" in kinds
+
+
+def test_golden_intro_explica_criterios_y_pesos():
+    ch = build_calidad(_profile(), {})
+    intro = [b for b in ch.blocks if b.kind == "markdown"][0].text
+    for needle in ("Completitud", "Validez", "Consistencia",
+                   "50%", "30%", "20%"):
+        assert needle in intro, f"falta {needle!r} en la intro de criterios"
+
+
+def test_golden_scores_incluyen_desglose_por_criterio():
+    ch = build_calidad(_profile(), {})
+    scores = _scores_table(ch)
+    assert scores is not None
+    assert scores.header == ["Columna", "Calidad", "Completitud",
+                             "Validez", "Consistencia"]
+    # 4 columns scored, none dropped.
+    assert len(scores.rows) == 4
+    names = {r[0] for r in scores.rows}
+    assert names == {"edad", "nombre", "flag_const", "limpia"}
+
+
+def test_golden_issues_en_espanol_separados_de_flags():
+    ch = build_calidad(_profile(), {})
+    issues = _issues_table(ch)
+    assert issues is not None
+    flat = " | ".join(" ".join(r) for r in issues.rows)
+    assert "nulos" in flat            # completeness issue (ES)
+    assert "outliers" in flat         # validity issue (ES)
+    assert "columna constante" in flat
+    assert "posible id de alta cardinalidad" in flat
+    # The raw type flag string must NOT leak as a "problem".
+    assert "constant" not in flat or "columna constante" in flat
+
+
+# --------------------------------------------------------------------------- #
+# Edges
+# --------------------------------------------------------------------------- #
+def test_edge_none_vacio_sin_columnas_devuelve_none():
+    assert build_calidad(None, None) is None
+    assert build_calidad({}, {}) is None
+    assert build_calidad({"columns": []}, {}) is None
+    assert build_calidad("not a dict", {}) is None
+
+
+def test_edge_perfil_limpio_sin_problemas_usa_nota():
+    prof = {
+        "quality_score": 100,
+        "columns": [
+            {"name": "a", "inferred_type": "float", "null_pct": 0.0,
+             "numeric": {"outlier_pct": 0.0}},
+            {"name": "b", "inferred_type": "float", "null_pct": 0.0,
+             "numeric": {"outlier_pct": 0.0}},
+        ],
+    }
+    ch = build_calidad(prof, {})
+    assert ch is not None
+    assert _issues_table(ch) is None  # no issues table
+    notes = [b for b in ch.blocks if b.kind == "note"]
+    assert notes and "No se detectaron problemas" in notes[0].text
+
+
+# --------------------------------------------------------------------------- #
+# Anti-cut: a wide profile with long names renders without truncation
+# --------------------------------------------------------------------------- #
+def _wide_profile(ncols: int = 22) -> dict:
+    cols = [
+        {"name": "identificador_unico_de_transaccion_con_nombre_muy_largo",
+         "inferred_type": "text", "null_pct": 0.0, "unique_pct": 0.99},
+        {"name": "columna_constante_sin_ninguna_variacion_de_valor",
+         "inferred_type": "text", "null_pct": 0.0, "flags": ["constant"]},
+    ]
+    for k in range(ncols - 2):
+        cols.append({
+            "name": f"metrica_numerica_de_negocio_{k:02d}_con_nombre_largo",
+            "inferred_type": "float", "null_pct": 0.1 + (k % 3) * 0.05,
+            "numeric": {"outlier_pct": 0.08, "min": 0, "max": 1000},
+        })
+    return {"table": "ancha", "quality_score": 70.0, "columns": cols}
+
+
+def test_anticut_pdf_y_pptx_no_truncan_nombres_largos():
+    prof = _wide_profile(22)
+    full = build_document(prof, {"dataset_name": "ancha"})
+    assert any(c.id == "calidad" for c in full)
+    # Render ONLY the calidad chapter so the anti-cut assertions are scoped to
+    # this chapter (other chapters, e.g. portada, legitimately contain '…').
+    chapters = [c for c in full if c.id == "calidad"]
+    long_name = "metrica_numerica_de_negocio_00_con_nombre_largo"
+    with tempfile.TemporaryDirectory() as d:
+        pdf = os.path.join(d, "q.pdf")
+        pptx = os.path.join(d, "q.pptx")
+        rp = render_pdf(chapters, pdf, {"title": "EDA"})
+        rx = render_pptx(chapters, pptx, {"title": "EDA"})
+        assert os.path.exists(pdf) and os.path.exists(pptx)
+        # The wide table forces pagination across several pages/slides.
+        assert (rp or {}).get("n_pages", 0) >= 2
+
+        # PDF: the long name survives whole once wraps (spaces/newlines) removed,
+        # and there is no truncation marker.
+        pdf_txt = "".join((pg.extract_text() or "") for pg in PdfReader(pdf).pages)
+        assert "…" not in pdf_txt and "..." not in pdf_txt
+        norm = re.sub(r"\s+", "", pdf_txt)
+        assert long_name in norm, "el nombre largo se cortó en el PDF"
+
+        # PPTX: long name present in some cell, untruncated.
+        allt = []
+        for s in Presentation(pptx).slides:
+            for sh in s.shapes:
+                if sh.has_text_frame:
+                    allt.append(sh.text_frame.text)
+                if sh.has_table:
+                    for row in sh.table.rows:
+                        for c in row.cells:
+                            allt.append(c.text)
+        joined = re.sub(r"\s+", "", "\n".join(allt))
+        assert long_name in joined, "el nombre largo se cortó en el PPTX"