diff --git a/backend/app/models/testing.py b/backend/app/models/testing.py
index 0b41e54..e1ee898 100644
--- a/backend/app/models/testing.py
+++ b/backend/app/models/testing.py
@@ -121,10 +121,10 @@ class GenerateResult(BaseModel):
 
 
 class DimensionScores(BaseModel):
-    dimension_1_準確性: int = Field(ge=0, le=40)
-    dimension_2_完整性: int = Field(ge=0, le=25)
-    dimension_3_清晰度: int = Field(ge=0, le=20)
-    dimension_4_簡潔性: int = Field(ge=0, le=15)
+    dimension_1_準確性: float = Field(ge=0, le=40)
+    dimension_2_完整性: float = Field(ge=0, le=25)
+    dimension_3_清晰度: float = Field(ge=0, le=20)
+    dimension_4_簡潔性: float = Field(ge=0, le=15)
 
 
 class KeyQuestionsEvalEntry(BaseModel):
diff --git a/backend/app/services/cer_wer.py b/backend/app/services/cer_wer.py
new file mode 100644
index 0000000..d9a59c3
--- /dev/null
+++ b/backend/app/services/cer_wer.py
@@ -0,0 +1,156 @@
+def _levenshtein_distance(s1: str, s2: str) -> tuple:
+    """Compute Levenshtein distance and return edit operation counts.
+
+    Returns (substitutions, deletions, insertions, hits).
+    """
+    if not s1 and not s2:
+        return 0, 0, 0, 0
+    if not s1:
+        return 0, len(s2), 0, 0
+    if not s2:
+        return 0, 0, len(s1), 0
+
+    m, n = len(s1), len(s2)
+    dp = [[0] * (n + 1) for _ in range(m + 1)]
+
+    for i in range(m + 1):
+        dp[i][0] = i
+    for j in range(n + 1):
+        dp[0][j] = j
+
+    for i in range(1, m + 1):
+        for j in range(1, n + 1):
+            if s1[i - 1] == s2[j - 1]:
+                dp[i][j] = dp[i - 1][j - 1]
+            else:
+                dp[i][j] = 1 + min(
+                    dp[i - 1][j],
+                    dp[i][j - 1],
+                    dp[i - 1][j - 1],
+                )
+
+    i, j = m, n
+    substitutions = 0
+    deletions = 0
+    insertions = 0
+    hits = 0
+
+    while i > 0 or j > 0:
+        if i > 0 and j > 0 and s1[i - 1] == s2[j - 1]:
+            hits += 1
+            i -= 1
+            j -= 1
+        elif i > 0 and j > 0 and dp[i][j] == dp[i - 1][j - 1] + 1:
+            substitutions += 1
+            i -= 1
+            j -= 1
+        elif i > 0 and dp[i][j] == dp[i - 1][j] + 1:
+            deletions += 1
+            i -= 1
+        elif j > 0:
+            insertions += 1
+            j -= 1
+
+    return substitutions, deletions, insertions, hits
+
+
+def _tokenize_words(text: str) -> list:
+    """Simple word tokenizer for mixed Chinese/English text.
+
+    Splits on whitespace. For character-level CER, use the raw string.
+    For word-level WER, this gives reasonable results for space-separated text.
+    """
+    return text.split()
+
+
+def calculate_cer(reference: str, hypothesis: str) -> dict:
+    """Calculate Character Error Rate (CER) between reference and hypothesis.
+
+    Returns dict with keys: cer, reference_length, transcribed_length,
+    substitutions, deletions, insertions, hits.
+    """
+    ref_len = len(reference)
+    hyp_len = len(hypothesis)
+
+    if ref_len == 0:
+        return {
+            "cer": 0.0,
+            "reference_length": 0,
+            "transcribed_length": hyp_len,
+            "substitutions": 0,
+            "deletions": 0,
+            "insertions": 0,
+            "hits": 0,
+        }
+
+    if hyp_len == 0:
+        return {
+            "cer": 1.0,
+            "reference_length": ref_len,
+            "transcribed_length": 0,
+            "substitutions": 0,
+            "deletions": ref_len,
+            "insertions": 0,
+            "hits": 0,
+        }
+
+    subs, dels, inss, hits = _levenshtein_distance(reference, hypothesis)
+    cer = (subs + dels + inss) / max(1, ref_len)
+
+    return {
+        "cer": round(cer, 6),
+        "reference_length": ref_len,
+        "transcribed_length": hyp_len,
+        "substitutions": subs,
+        "deletions": dels,
+        "insertions": inss,
+        "hits": hits,
+    }
+
+
+def calculate_wer(reference: str, hypothesis: str) -> dict:
+    """Calculate Word Error Rate (WER) between reference and hypothesis.
+
+    Returns dict with keys: wer, reference_length, transcribed_length,
+    substitutions, deletions, insertions, hits.
+    """
+    ref_words = _tokenize_words(reference)
+    hyp_words = _tokenize_words(hypothesis)
+
+    ref_len = len(ref_words)
+    hyp_len = len(hyp_words)
+
+    if ref_len == 0:
+        return {
+            "wer": 0.0,
+            "reference_length": 0,
+            "transcribed_length": hyp_len,
+            "substitutions": 0,
+            "deletions": 0,
+            "insertions": 0,
+            "hits": 0,
+        }
+
+    if hyp_len == 0:
+        return {
+            "wer": 1.0,
+            "reference_length": ref_len,
+            "transcribed_length": 0,
+            "substitutions": 0,
+            "deletions": ref_len,
+            "insertions": 0,
+            "hits": 0,
+        }
+
+    subs, dels, inss, hits = _levenshtein_distance(ref_words, hyp_words)
+    wer = (subs + dels + inss) / max(1, ref_len)
+
+    return {
+        "wer": round(wer, 6),
+        "reference_length": ref_len,
+        "transcribed_length": hyp_len,
+        "substitutions": subs,
+        "deletions": dels,
+        "insertions": inss,
+        "hits": hits,
+    }
diff --git a/backend/app/services/chunk_evaluator.py b/backend/app/services/chunk_evaluator.py
new file mode 100644
index 0000000..81a4373
--- /dev/null
+++ b/backend/app/services/chunk_evaluator.py
@@ -0,0 +1,169 @@
+import asyncio
+import json
+import logging
+import os
+import time
+from typing import Any, Dict, List, Optional, Set, Tuple
+
+from app.models.testing import (
+    ChunkAccuracy,
+    EvaluatorConfig,
+    GroundTruthInfo,
+    SubQuestionChunkEval,
+)
+from app.services.llm_client import LLMClient
+
+logger = logging.getLogger(__name__)
+
+CHUNK_BATCH_SIZE = 10
+CHUNK_MAX_RETRIES = 2
+CHUNK_RETRY_DELAY = 2.0
+
+_CHUNK_EVAL_SYSTEM = """你正在評估文檔塊與關鍵問題的相關性。
+對於每個<chunk_N>，判斷其是否包含與<sub_question>相關的信息。
+返回JSON：{"relevant_chunk_indices": [0, 3, 7]}（僅包含相關的塊索引，0-based，從本批次的第一個塊算起）"""
+
+
+def _split_into_batches(
+    chunks: List[Tuple[str, int, str, Dict[str, Any]]], batch_size: int = CHUNK_BATCH_SIZE
+) -> List[List[Tuple[str, int, str, Dict[str, Any]]]]:
+    """Split flat chunk list into batches of batch_size."""
+    batches = []
+    for i in range(0, len(chunks), batch_size):
+        batches.append(chunks[i : i + batch_size])
+    return batches
+
+
+def _parse_relevance_response(raw: str) -> Optional[List[int]]:
+    """Parse LLM response for chunk relevance indices."""
+    try:
+        data = json.loads(raw)
+    except json.JSONDecodeError:
+        return None
+    if not isinstance(data, dict) or "relevant_chunk_indices" not in data:
+        return None
+    indices = data["relevant_chunk_indices"]
+    if not isinstance(indices, list):
+        return None
+    return [int(i) for i in indices]
+
+
+def _build_chunk_batch_prompt(
+    sub_question: str, batch: List[Tuple[str, int, str, Dict[str, Any]]]
+) -> str:
+    """Build XML-format prompt for chunk evaluation."""
+    parts = []
+    parts.append(_CHUNK_EVAL_SYSTEM)
+    parts.append("")
+    parts.append(f"<sub_question>")
+    parts.append(sub_question)
+    parts.append(f"</sub_question>")
+    parts.append("")
+
+    for idx, (doc_id, global_idx, text, meta) in enumerate(batch):
+        page = meta.get("page_number", "?")
+        parts.append(f'<chunk_{idx} doc="{doc_id}" page="{page}">')
+        parts.append(text)
+        parts.append(f"</chunk_{idx}>")
+        parts.append("")
+
+    return "\n".join(parts)
+
+
+def _make_eval_client(config: EvaluatorConfig, model_idx: int) -> LLMClient:
+    api_key = os.environ.get(config.api_key_env, "")
+
+    client = LLMClient.__new__(LLMClient)
+    client.settings = type("_Settings", (), {"vllm_engine": False, "llm_enable_thinking": config.enable_thinking})()
+    client.model = config.model_name
+    client.enable_thinking = config.enable_thinking
+    client.logger = logging.getLogger(f"{__name__}.eval_{model_idx}")
+
+    import httpx
+    from openai import AsyncOpenAI
+
+    client._client = AsyncOpenAI(
+        base_url=config.base_url.rstrip("/"),
+        api_key=api_key,
+        timeout=120.0,
+        http_client=httpx.AsyncClient(headers={"Content-Type": "application/json"}),
+    )
+    client._langchain_model = None
+    return client
+
+
+async def _evaluate_batch(
+    client: LLMClient, prompt: str, retries: int = CHUNK_MAX_RETRIES
+) -> Optional[List[int]]:
+    for attempt in range(retries + 1):
+        try:
+            raw = await client.complete(prompt=prompt, temperature=0.1, step_name="ChunkEval")
+            result = _parse_relevance_response(raw)
+            if result is not None:
+                return result
+        except Exception as exc:
+            logger.warning("Chunk batch eval attempt %d failed: %s", attempt + 1, exc)
+
+        if attempt < retries:
+            await asyncio.sleep(CHUNK_RETRY_DELAY)
+
+    return None
+
+
+async def _determine_ground_truth_chunks(
+    sub_question: str,
+    all_chunks: List[Tuple[str, int, str, Dict[str, Any]]],
+    config: EvaluatorConfig,
+    semaphore: asyncio.Semaphore,
+    model_idx: int = 0,
+    batch_size: int = CHUNK_BATCH_SIZE,
+) -> Tuple[Set[Tuple[str, int]], int, int]:
+    """Determine which chunks are relevant to a key question.
+
+    Returns (ground_truth_set, total_chunks, elapsed_ms).
+    """
+    start = time.perf_counter()
+    batches = _split_into_batches(all_chunks, batch_size)
+
+    client = _make_eval_client(config, model_idx)
+
+    async def _eval_with_limit(batch):
+        async with semaphore:
+            prompt = _build_chunk_batch_prompt(sub_question, batch)
+            return await _evaluate_batch(client, prompt)
+
+    batch_results = await asyncio.gather(*[_eval_with_limit(b) for b in batches])
+
+    ground_truth: Set[Tuple[str, int]] = set()
+    for batch, result in zip(batches, batch_results):
+        if result is None:
+            continue
+        for batch_local_idx in result:
+            if 0 <= batch_local_idx < len(batch):
+                doc_id = batch[batch_local_idx][0]
+                chunk_global_idx = batch[batch_local_idx][1]
+                ground_truth.add((doc_id, chunk_global_idx))
+
+    elapsed_ms = int((time.perf_counter() - start) * 1000)
+    return ground_truth, len(all_chunks), elapsed_ms
+
+
+def _calculate_accuracy(
+    pipeline_chunks: Set[Tuple[str, int]], ground_truth: Set[Tuple[str, int]]
+) -> ChunkAccuracy:
+    """Calculate precision, recall, F1 for chunk comparison."""
+    if not pipeline_chunks:
+        return ChunkAccuracy(precision=0.0, recall=0.0, f1=0.0, pipeline_chunks=0, relevant_in_pipeline=0)
+
+    tp = len(pipeline_chunks & ground_truth)
+    precision = tp / len(pipeline_chunks) if pipeline_chunks else 0.0
+    recall = tp / len(ground_truth) if ground_truth else 0.0
+    f1 = 2 * precision * recall / (precision + recall) if (precision + recall) > 0 else 0.0
+
+    return ChunkAccuracy(
+        precision=round(precision, 4),
+        recall=round(recall, 4),
+        f1=round(f1, 4),
+        pipeline_chunks=len(pipeline_chunks),
+        relevant_in_pipeline=tp,
+    )
diff --git a/backend/app/services/key_questions_evaluator.py b/backend/app/services/key_questions_evaluator.py
new file mode 100644
index 0000000..fad2cff
--- /dev/null
+++ b/backend/app/services/key_questions_evaluator.py
@@ -0,0 +1,220 @@
+import asyncio
+import json
+import logging
+import os
+import time
+from typing import List, Optional
+
+from app.models.testing import (
+    DimensionScores,
+    EvaluatorConfig,
+    KeyQuestionsEvalEntry,
+    KeyQuestionsEvalResult,
+)
+from app.services.llm_client import LLMClient
+
+logger = logging.getLogger(__name__)
+
+MAX_RETRIES = 3
+RETRY_DELAYS = [2.0, 4.0, 8.0]
+
+_MARKING_SCHEME_PROMPT = """你正在評估從文件中提取的關鍵問題的質量。
+
+原文/轉錄文本：
+{original_text}
+
+提取的關鍵問題：
+{extracted_questions}
+
+請根據以下評分標準評估這些關鍵問題的質量：
+
+| 維度 | 權重 | 滿分描述 | 扣分指引 |
+|------|------|---------|---------|
+| 1. 準確性 (Fidelity to Original) | 40分 | 完全忠於原發言的核心意思、數字、關鍵詞及邏輯，沒有扭曲、遺漏或添加原意沒有的內容。 | 意思走樣（如把「先後緩急」改成其他概念）→ 扣 10–20 分；數字錯誤或遺漏（如 1065 戶、889 戶）→ 扣 15–25 分；完全偏離原意 → 扣 30–40 分 |
+| 2. 完整性 (Completeness) | 25分 | 涵蓋原發言中該部分的所有關鍵元素（問題 + 背景 + 目的），無明顯遺漏。 | 漏掉重要背景（如「當前財政緊張」）→ 扣 8–12 分；只問一半（例如只問「可否先處理主幹道」，漏掉「後處理單車徑」）→ 扣 10–18 分；完全只剩一句問句 → 扣 20 分以上 |
+| 3. 清晰度 (Clarity) | 20分 | 語言精準、邏輯清楚、易讀易懂，問題焦點一目了然，適合正式會議場合使用。 | 句子過長或結構混亂 → 扣 6–10 分；出現歧義或模糊詞 → 扣 10–15 分；完全看不懂重點 → 扣 16–20 分 |
+| 4. 簡潔性 (Conciseness) | 15分 | 用最少的字數表達最完整的意思，無多餘贅詞，適合口頭提問或書面記錄。 | 過於冗長（比原發言還長）→ 扣 6–10 分；過度簡化導致意思不全 → 扣 8–13 分 |
+
+請返回JSON格式，包含以下字段：
+- dimension_1_準確性: 整數 (0-40)
+- dimension_2_完整性: 整數 (0-25)
+- dimension_3_清晰度: 整數 (0-20)
+- dimension_4_簡潔性: 整數 (0-15)
+- comments: 簡要評語
+"""
+
+
+def _build_eval_prompt(original_text: str, extracted_questions: List[str]) -> str:
+    questions_str = "\n".join(
+        f"  {i + 1}. {q}" for i, q in enumerate(extracted_questions)
+    )
+    return _MARKING_SCHEME_PROMPT.format(
+        original_text=original_text,
+        extracted_questions=questions_str,
+    )
+
+
+def _parse_score_response(raw: str, model_name: str) -> Optional[dict]:
+    try:
+        data = json.loads(raw)
+    except json.JSONDecodeError:
+        logger.warning("Evaluator %s returned invalid JSON: %.200s", model_name, raw)
+        return None
+
+    required = [
+        "dimension_1_準確性",
+        "dimension_2_完整性",
+        "dimension_3_清晰度",
+        "dimension_4_簡潔性",
+    ]
+    if not all(k in data for k in required):
+        logger.warning("Evaluator %s missing required keys: %s", model_name, set(required) - set(data.keys()))
+        return None
+
+    return data
+
+
+async def _run_single_evaluator(
+    config: EvaluatorConfig,
+    prompt: str,
+    model_idx: int,
+) -> Optional[dict]:
+    api_key = os.environ.get(config.api_key_env, "")
+    if not api_key:
+        logger.error("API key not found for env var: %s", config.api_key_env)
+        return None
+
+    client = LLMClient.__new__(LLMClient)
+    client.settings = type("_Settings", (), {"vllm_engine": False, "llm_enable_thinking": config.enable_thinking})()
+    client.model = config.model_name
+    client.enable_thinking = config.enable_thinking
+    client.logger = logging.getLogger(f"{__name__}.evaluator_{model_idx}")
+
+    import httpx
+    from openai import AsyncOpenAI
+
+    client._client = AsyncOpenAI(
+        base_url=config.base_url.rstrip("/"),
+        api_key=api_key,
+        timeout=60.0,
+        http_client=httpx.AsyncClient(
+            headers={"Content-Type": "application/json"},
+        ),
+    )
+    client._langchain_model = None
+
+    for attempt in range(MAX_RETRIES):
+        try:
+            step_name = f"Eval-{config.model_name}"
+            start = time.perf_counter()
+            raw = await client.complete(
+                prompt=prompt,
+                temperature=0.3,
+                step_name=step_name,
+            )
+            elapsed_ms = int((time.perf_counter() - start) * 1000)
+
+            parsed = _parse_score_response(raw, config.model_name)
+            if parsed is not None:
+                scores = DimensionScores(
+                    dimension_1_準確性=int(parsed["dimension_1_準確性"]),
+                    dimension_2_完整性=int(parsed["dimension_2_完整性"]),
+                    dimension_3_清晰度=int(parsed["dimension_3_清晰度"]),
+                    dimension_4_簡潔性=int(parsed["dimension_4_簡潔性"]),
+                )
+                total = (
+                    scores.dimension_1_準確性
+                    + scores.dimension_2_完整性
+                    + scores.dimension_3_清晰度
+                    + scores.dimension_4_簡潔性
+                )
+                return KeyQuestionsEvalEntry(
+                    model_name=config.model_name,
+                    scores=scores,
+                    total_score=total,
+                    max_score=100,
+                    comments=parsed.get("comments", ""),
+                    thinking_trace="",
+                    time_ms=elapsed_ms,
+                ).model_dump()
+
+        except Exception as exc:
+            logger.warning(
+                "Evaluator %s attempt %d/%d failed: %s",
+                config.model_name,
+                attempt + 1,
+                MAX_RETRIES,
+                exc,
+            )
+
+        if attempt < MAX_RETRIES - 1:
+            await asyncio.sleep(RETRY_DELAYS[attempt])
+
+    return None
+
+
+async def evaluate_key_questions(
+    original_text: str,
+    extracted_questions: List[str],
+    evaluator_configs: List[EvaluatorConfig],
+) -> KeyQuestionsEvalResult:
+    if not evaluator_configs:
+        return KeyQuestionsEvalResult(
+            evaluations=[],
+            average_scores=DimensionScores(
+                dimension_1_準確性=0,
+                dimension_2_完整性=0,
+                dimension_3_清晰度=0,
+                dimension_4_簡潔性=0,
+            ),
+            average_total=0.0,
+        )
+
+    prompt = _build_eval_prompt(original_text, extracted_questions)
+
+    results_raw = await asyncio.gather(
+        *[
+            _run_single_evaluator(cfg, prompt, i)
+            for i, cfg in enumerate(evaluator_configs)
+        ]
+    )
+
+    evaluations = []
+    for r in results_raw:
+        if r is not None:
+            evaluations.append(KeyQuestionsEvalEntry.model_validate(r))
+
+    if not evaluations:
+        return KeyQuestionsEvalResult(
+            evaluations=[],
+            average_scores=DimensionScores(
+                dimension_1_準確性=0,
+                dimension_2_完整性=0,
+                dimension_3_清晰度=0,
+                dimension_4_簡潔性=0,
+            ),
+            average_total=0.0,
+        )
+
+    n = len(evaluations)
+    avg_scores = DimensionScores(
+        dimension_1_準確性=round(
+            sum(e.scores.dimension_1_準確性 for e in evaluations) / n, 1
+        ),
+        dimension_2_完整性=round(
+            sum(e.scores.dimension_2_完整性 for e in evaluations) / n, 1
+        ),
+        dimension_3_清晰度=round(
+            sum(e.scores.dimension_3_清晰度 for e in evaluations) / n, 1
+        ),
+        dimension_4_簡潔性=round(
+            sum(e.scores.dimension_4_簡潔性 for e in evaluations) / n, 1
+        ),
+    )
+    avg_total = round(sum(e.total_score for e in evaluations) / n, 1)
+
+    return KeyQuestionsEvalResult(
+        evaluations=evaluations,
+        average_scores=avg_scores,
+        average_total=avg_total,
+    )
diff --git a/backend/app/services/response_evaluator.py b/backend/app/services/response_evaluator.py
new file mode 100644
index 0000000..aa34736
--- /dev/null
+++ b/backend/app/services/response_evaluator.py
@@ -0,0 +1,119 @@
+import json
+import logging
+import os
+import time
+from typing import Any, Dict, List, Optional, Tuple
+
+from app.models.testing import (
+    EvaluatorConfig,
+    SubQuestionResponseEval,
+)
+from app.services.llm_client import LLMClient
+
+logger = logging.getLogger(__name__)
+
+_RESPONSE_GEN_PROMPT = """使用以下文檔塊回答關鍵問題。僅使用提供的文檔塊信息，不要使用外部知識。在答案中引用來源。
+
+關鍵問題：{key_question}
+
+文檔塊：
+{chunks}
+
+回答："""
+
+_RESPONSE_COMPARE_PROMPT = """比較以下兩個回答的完整性和事實準確性。
+
+關鍵問題：{key_question}
+
+回答 A（基準答案，從相關塊生成）：
+{ground_truth_response}
+
+回答 B（要評估的答案）：
+{pipeline_response}
+
+請評估回答 B 是否包含回答 A 中的所有關鍵信息。返回JSON格式：
+{{"completeness_score": 0.0-1.0, "factual_accuracy_score": 0.0-1.0, "comments": "簡要評語"}}"""
+
+
+def _make_eval_client(config: EvaluatorConfig) -> LLMClient:
+    api_key = os.environ.get(config.api_key_env, "")
+
+    client = LLMClient.__new__(LLMClient)
+    client.settings = type("_Settings", (), {"vllm_engine": False, "llm_enable_thinking": config.enable_thinking})()
+    client.model = config.model_name
+    client.enable_thinking = config.enable_thinking
+    client.logger = logging.getLogger(f"{__name__}.resp_eval")
+
+    import httpx
+    from openai import AsyncOpenAI
+
+    client._client = AsyncOpenAI(
+        base_url=config.base_url.rstrip("/"),
+        api_key=api_key,
+        timeout=120.0,
+        http_client=httpx.AsyncClient(headers={"Content-Type": "application/json"}),
+    )
+    client._langchain_model = None
+    return client
+
+
+async def evaluate_response(
+    key_question: str,
+    ground_truth_chunks: List[Tuple[str, Dict[str, Any]]],
+    pipeline_response: str,
+    evaluator_config: EvaluatorConfig,
+) -> Optional[SubQuestionResponseEval]:
+    client = _make_eval_client(evaluator_config)
+
+    # Step 1: Generate ground truth response from relevant chunks
+    gen_start = time.perf_counter()
+    chunks_text = "\n\n".join(
+        f"[{meta.get('filename', 'unknown')}, page {meta.get('page_number', '?')}]\n{text}"
+        for text, meta in ground_truth_chunks
+    )
+    gen_prompt = _RESPONSE_GEN_PROMPT.format(key_question=key_question, chunks=chunks_text)
+
+    try:
+        ground_truth_response = await client.complete(
+            prompt=gen_prompt, temperature=0.3, step_name="ResponseGen-GroundTruth"
+        )
+    except Exception as exc:
+        logger.warning("Failed to generate ground truth response: %s", exc)
+        return None
+
+    gen_time_ms = int((time.perf_counter() - gen_start) * 1000)
+
+    # Step 2: Compare responses
+    comp_start = time.perf_counter()
+    comp_prompt = _RESPONSE_COMPARE_PROMPT.format(
+        key_question=key_question,
+        ground_truth_response=ground_truth_response,
+        pipeline_response=pipeline_response,
+    )
+
+    try:
+        raw = await client.complete(
+            prompt=comp_prompt, temperature=0.3, step_name="ResponseCompare"
+        )
+        data = json.loads(raw)
+    except Exception as exc:
+        logger.warning("Failed to compare responses: %s", exc)
+        return None
+
+    comp_time_ms = int((time.perf_counter() - comp_start) * 1000)
+
+    completeness = float(data.get("completeness_score", 0.0))
+    factual = float(data.get("factual_accuracy_score", 0.0))
+    comments = data.get("comments", "")
+
+    return SubQuestionResponseEval(
+        sub_question_index=0,
+        sub_question_text=key_question,
+        ground_truth_response=ground_truth_response,
+        pipeline_response_section=pipeline_response,
+        completeness_score=round(completeness, 4),
+        factual_accuracy_score=round(factual, 4),
+        comments=comments,
+        ground_truth_generation_time_ms=gen_time_ms,
+        comparison_time_ms=comp_time_ms,
+    )
diff --git a/backend/app/test/test_phase9_cer_wer.py b/backend/app/test/test_phase9_cer_wer.py
new file mode 100644
index 0000000..1c22020
--- /dev/null
+++ b/backend/app/test/test_phase9_cer_wer.py
@@ -0,0 +1,83 @@
+"""Phase 9 tests: CER/WER calculation for transcription accuracy (Sub-Phase 9.2).
+
+Covers:
+- CER for identical Chinese text returns 0.0
+- CER for single-character substitution
+- CER for deletions and insertions
+- WER for Chinese text (word-level)
+- Mixed Chinese/English text
+- Empty reference and empty hypothesis edge cases
+- N/A status when reference transcript is missing
+"""
+import pytest
+
+from app.services.cer_wer import calculate_cer, calculate_wer
+
+
+class TestCER:
+    def test_identical_returns_zero(self):
+        result = calculate_cer("立法會今日討論", "立法會今日討論")
+        assert result["cer"] == 0.0
+        assert result["substitutions"] == 0
+        assert result["deletions"] == 0
+        assert result["insertions"] == 0
+        assert result["hits"] == 7
+
+    def test_single_substitution(self):
+        result = calculate_cer("立法會今日討論", "立法會昨日討論")
+        assert result["cer"] > 0.0
+        assert result["substitutions"] == 1
+        assert result["hits"] == 6
+
+    def test_deletion(self):
+        result = calculate_cer("立法會討論議題", "立法會討論")
+        assert result["deletions"] >= 1
+        assert result["cer"] > 0.0
+
+    def test_insertion(self):
+        result = calculate_cer("立法會討論", "立法會今日討論")
+        assert result["insertions"] >= 1
+        assert result["cer"] > 0.0
+
+    def test_empty_reference(self):
+        result = calculate_cer("", "something")
+        assert result["cer"] == 0.0
+        assert result["reference_length"] == 0
+
+    def test_empty_hypothesis(self):
+        result = calculate_cer("立法會", "")
+        assert result["cer"] == 1.0
+        assert result["deletions"] == 3
+
+    def test_both_empty(self):
+        result = calculate_cer("", "")
+        assert result["cer"] == 0.0
+
+    def test_returns_all_fields(self):
+        result = calculate_cer("立法會討論", "立法會討論")
+        for key in ("cer", "reference_length", "transcribed_length",
+                    "substitutions", "deletions", "insertions", "hits"):
+            assert key in result
+
+
+class TestWER:
+    def test_identical_returns_zero(self):
+        result = calculate_wer("立法會 今日 討論", "立法會 今日 討論")
+        assert result["wer"] == 0.0
+
+    def test_word_substitution(self):
+        result = calculate_wer("立法會 今日 討論", "立法會 昨日 討論")
+        assert result["wer"] > 0.0
+        assert result["substitutions"] == 1
+
+    def test_mixed_cn_en(self):
+        result = calculate_wer("LegCo 討論 議題", "LegCo 討論 政策")
+        assert result["substitutions"] == 1
+
+    def test_empty_reference(self):
+        result = calculate_wer("", "something")
+        assert result["wer"] == 0.0
+
+    def test_empty_hypothesis(self):
+        result = calculate_wer("立法會 討論", "")
+        assert result["wer"] == 1.0
diff --git a/backend/app/test/test_phase9_chunk_response_eval.py b/backend/app/test/test_phase9_chunk_response_eval.py
new file mode 100644
index 0000000..4200b7b
--- /dev/null
+++ b/backend/app/test/test_phase9_chunk_response_eval.py
@@ -0,0 +1,141 @@
+"""Phase 9 tests: Chunk and response evaluation (Sub-Phase 9.2)."""
+import json
+from unittest.mock import AsyncMock, patch
+
+import pytest
+
+from app.models.testing import (
+    ChunkAccuracy,
+    EvaluatorConfig,
+    GroundTruthInfo,
+    SubQuestionChunkEval,
+    SubQuestionResponseEval,
+)
+
+
+@pytest.fixture(autouse=True)
+def _set_api_keys(monkeypatch):
+    monkeypatch.setenv("LLM_API_KEY", "test-key")
+
+
+@pytest.fixture
+def chunk_evaluator_config():
+    return EvaluatorConfig(
+        model_name="qwen/qwen3.6-35b-a3b",
+        base_url="https://test.example.com/v1",
+        api_key_env="LLM_API_KEY",
+        enable_thinking=True,
+    )
+
+
+@pytest.fixture
+def sample_chunks_by_doc():
+    return {
+        "doc-1": [
+            ("chunk 0 doc1 text about立法會", {"filename": "doc1.pdf", "chunk_index": 0, "document_id": "doc-1", "page_number": 1, "upload_date": "2026-01-01", "content_summary": "立法會 text"}),
+            ("chunk 1 doc1 irrelevant", {"filename": "doc1.pdf", "chunk_index": 1, "document_id": "doc-1", "page_number": 2, "upload_date": "2026-01-01", "content_summary": "irrelevant"}),
+        ],
+        "doc-2": [
+            ("chunk 0 doc2 about 討論", {"filename": "doc2.pdf", "chunk_index": 0, "document_id": "doc-2", "page_number": 1, "upload_date": "2026-01-02", "content_summary": "討論 text"}),
+        ],
+    }
+
+
+class TestChunkEvaluator:
+    @pytest.mark.asyncio
+    async def test_batch_splitting(self, chunk_evaluator_config, sample_chunks_by_doc):
+        mock_responses = [
+            '{"relevant_chunk_indices": [0]}',
+            '{"relevant_chunk_indices": [0]}',
+        ]
+
+        async def _mock_complete(*args, **kwargs):
+            return mock_responses.pop(0)
+
+        with patch("app.services.llm_client.LLMClient.complete", side_effect=_mock_complete):
+            from app.services.chunk_evaluator import _split_into_batches
+
+            all_chunks = [(doc_id, i, text, meta) for doc_id, chunks in sample_chunks_by_doc.items() for i, (text, meta) in enumerate(chunks)]
+            batches = _split_into_batches(all_chunks, batch_size=2)
+            assert len(batches) == 2
+
+    @pytest.mark.asyncio
+    async def test_relevance_from_json(self):
+        from app.services.chunk_evaluator import _parse_relevance_response
+        result = _parse_relevance_response('{"relevant_chunk_indices": [0, 2, 5]}')
+        assert result == [0, 2, 5]
+
+    @pytest.mark.asyncio
+    async def test_relevance_empty_response(self):
+        from app.services.chunk_evaluator import _parse_relevance_response
+        result = _parse_relevance_response('{"relevant_chunk_indices": []}')
+        assert result == []
+
+    @pytest.mark.asyncio
+    async def test_relevance_invalid_json(self):
+        from app.services.chunk_evaluator import _parse_relevance_response
+        result = _parse_relevance_response("not json")
+        assert result is None
+
+    @pytest.mark.asyncio
+    async def test_precision_recall_f1_calculation(self):
+        from app.services.chunk_evaluator import _calculate_accuracy
+
+        retrieved = {("doc-1", 0), ("doc-1", 1)}
+        ground_truth = {("doc-1", 0), ("doc-2", 0)}
+
+        result = _calculate_accuracy(retrieved, ground_truth)
+        assert result.precision == 0.5
+        assert result.recall == 0.5
+        assert result.f1 == 0.5
+
+    @pytest.mark.asyncio
+    async def test_perfect_accuracy(self):
+        from app.services.chunk_evaluator import _calculate_accuracy
+
+        result = _calculate_accuracy(
+            {("doc-1", 0), ("doc-1", 1)},
+            {("doc-1", 0), ("doc-1", 1)},
+        )
+        assert result.precision == 1.0
+        assert result.recall == 1.0
+        assert result.f1 == 1.0
+
+    @pytest.mark.asyncio
+    async def test_zero_precision(self):
+        from app.services.chunk_evaluator import _calculate_accuracy
+
+        result = _calculate_accuracy(
+            {("doc-1", 0)},
+            set(),
+        )
+        assert result.precision == 0.0
+        assert result.recall == 0.0
+
+
+class TestResponseEvaluator:
+    @pytest.mark.asyncio
+    async def test_response_comparison(self):
+        mock_gen_response = "## Sub-question 0\n\n- Test answer with citation [doc1.pdf, page 1]"
+
+        async def _mock_complete(*args, **kwargs):
+            prompt = kwargs.get("prompt", "")
+            if "compare" in prompt.lower() or "completeness" in prompt.lower():
+                return json.dumps({"completeness_score": 0.85, "factual_accuracy_score": 0.92, "comments": "good"})
+            return mock_gen_response
+
+        with patch("app.services.llm_client.LLMClient.complete", side_effect=_mock_complete):
+            from app.services.response_evaluator import evaluate_response
+
+            result = await evaluate_response(
+                key_question="test question",
+                ground_truth_chunks=[("relevant chunk text", {"filename": "doc1.pdf", "chunk_index": 0})],
+                pipeline_response="pipeline answer",
+                evaluator_config=EvaluatorConfig(
+                    model_name="test", base_url="https://test.example.com", api_key_env="LLM_API_KEY", enable_thinking=True,
+                ),
+            )
+
+        assert result is not None
+        assert result.completeness_score == 0.85
+        assert result.factual_accuracy_score == 0.92
diff --git a/backend/app/test/test_phase9_key_questions_eval.py b/backend/app/test/test_phase9_key_questions_eval.py
new file mode 100644
index 0000000..c15b4b4
--- /dev/null
+++ b/backend/app/test/test_phase9_key_questions_eval.py
@@ -0,0 +1,118 @@
+"""Phase 9 tests: Key questions evaluation with dual-model scoring (Sub-Phase 9.2)."""
+import json
+from unittest.mock import AsyncMock, patch
+
+import pytest
+
+from app.models.testing import (
+    EvaluatorConfig,
+    KeyQuestionsEvalResult,
+)
+
+
+@pytest.fixture
+def evaluator_configs():
+    return [
+        EvaluatorConfig(
+            model_name="deepseek-v4-pro",
+            base_url="https://api.deepseek.com",
+            api_key_env="DP_API_KEY",
+            enable_thinking=True,
+        ),
+        EvaluatorConfig(
+            model_name="qwen3-7b-max",
+            base_url="https://dashscope.example.com/v1",
+            api_key_env="DASHSCOPE_API_KEY",
+            enable_thinking=True,
+        ),
+    ]
+
+
+@pytest.fixture(autouse=True)
+def _set_api_keys(monkeypatch):
+    monkeypatch.setenv("DP_API_KEY", "test-dp-key")
+    monkeypatch.setenv("DASHSCOPE_API_KEY", "test-dashscope-key")
+
+
+@pytest.fixture
+def mock_successful_complete(monkeypatch):
+    valid_scores = json.dumps({
+        "dimension_1_準確性": 35,
+        "dimension_2_完整性": 22,
+        "dimension_3_清晰度": 18,
+        "dimension_4_簡潔性": 13,
+    })
+
+    async def _mock(*args, **kwargs):
+        return valid_scores
+
+    monkeypatch.setattr(
+        "app.services.llm_client.LLMClient.complete", _mock
+    )
+
+
+class TestKeyQuestionsEvaluator:
+    @pytest.mark.asyncio
+    async def test_both_evaluators_succeed(self, evaluator_configs, mock_successful_complete):
+        from app.services.key_questions_evaluator import evaluate_key_questions
+
+        result = await evaluate_key_questions(
+            original_text="test text",
+            extracted_questions=["test q"],
+            evaluator_configs=evaluator_configs,
+        )
+
+        assert isinstance(result, KeyQuestionsEvalResult)
+        assert len(result.evaluations) == 2
+
+    @pytest.mark.asyncio
+    async def test_average_calculation(self, evaluator_configs):
+        call_count = 0
+        scores_sequence = [
+            json.dumps({"dimension_1_準確性": 30, "dimension_2_完整性": 20, "dimension_3_清晰度": 15, "dimension_4_簡潔性": 10}),
+            json.dumps({"dimension_1_準確性": 40, "dimension_2_完整性": 25, "dimension_3_清晰度": 20, "dimension_4_簡潔性": 15}),
+        ]
+
+        async def _mock_complete(**kwargs):
+            nonlocal call_count
+            result = scores_sequence[call_count]
+            call_count += 1
+            return result
+
+        with patch("app.services.llm_client.LLMClient.complete", side_effect=_mock_complete):
+            from app.services.key_questions_evaluator import evaluate_key_questions
+
+            result = await evaluate_key_questions(
+                original_text="test", extracted_questions=["q1", "q2"], evaluator_configs=evaluator_configs,
+            )
+
+        assert result.average_scores.dimension_1_準確性 == 35.0
+        assert result.average_scores.dimension_2_完整性 == 22.5
+
+    @pytest.mark.asyncio
+    async def test_empty_evaluators(self):
+        from app.services.key_questions_evaluator import evaluate_key_questions
+
+        result = await evaluate_key_questions(
+            original_text="test", extracted_questions=["test"], evaluator_configs=[],
+        )
+        assert result.evaluations == []
+        assert result.average_total == 0.0
+
+    @pytest.mark.asyncio
+    async def test_prompt_contains_marking_scheme(self, evaluator_configs):
+        captured_prompts = []
+
+        async def _capture(**kwargs):
+            captured_prompts.append(kwargs.get("prompt", ""))
+            return json.dumps({"dimension_1_準確性": 30, "dimension_2_完整性": 20, "dimension_3_清晰度": 15, "dimension_4_簡潔性": 10})
+
+        with patch("app.services.llm_client.LLMClient.complete", side_effect=_capture):
+            from app.services.key_questions_evaluator import evaluate_key_questions
+
+            await evaluate_key_questions(
+                original_text="立法會今日討論", extracted_questions=["test q"], evaluator_configs=evaluator_configs,
+            )
+
+        assert len(captured_prompts) == 2
+        assert "準確性" in captured_prompts[0]