diff --git a/backend/app/api/v1/dashboard.py b/backend/app/api/v1/dashboard.py
new file mode 100644
index 00000000..c53920b0
--- /dev/null
+++ b/backend/app/api/v1/dashboard.py
@@ -0,0 +1,51 @@
+import uuid
+from datetime import date
+
+from fastapi import APIRouter, Depends
+from sqlalchemy import func, select
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.core.deps import get_db_session, require_study_member
+from app.models.milestone import Milestone
+from app.models.task import Task
+from app.schemas.progress import StudyProgressRead
+
+router = APIRouter()
+
+
+@router.get("/progress", response_model=StudyProgressRead, dependencies=[Depends(require_study_member())])
+async def get_progress(
+    study_id: uuid.UUID,
+    db: AsyncSession = Depends(get_db_session),
+) -> StudyProgressRead:
+    # Milestones
+    milestone_total_stmt = select(func.count()).select_from(Milestone).where(Milestone.study_id == study_id)
+    milestone_done_stmt = select(func.count()).select_from(Milestone).where(
+        Milestone.study_id == study_id, Milestone.status == "DONE"
+    )
+    task_total_stmt = select(func.count()).select_from(Task).where(Task.study_id == study_id)
+    task_done_stmt = select(func.count()).select_from(Task).where(Task.study_id == study_id, Task.status == "DONE")
+    task_overdue_stmt = select(func.count()).select_from(Task).where(
+        Task.study_id == study_id,
+        Task.due_date < date.today(),
+        Task.status != "DONE",
+    )
+
+    milestone_total = (await db.execute(milestone_total_stmt)).scalar_one()
+    milestone_done = (await db.execute(milestone_done_stmt)).scalar_one()
+    task_total = (await db.execute(task_total_stmt)).scalar_one()
+    task_done = (await db.execute(task_done_stmt)).scalar_one()
+    task_overdue = (await db.execute(task_overdue_stmt)).scalar_one()
+
+    total_items = milestone_total + task_total
+    done_items = milestone_done + task_done
+    completion_rate = float(done_items / total_items) if total_items else 0.0
+
+    return StudyProgressRead(
+        milestones_total=milestone_total,
+        milestones_done=milestone_done,
+        tasks_total=task_total,
+        tasks_done=task_done,
+        tasks_overdue=task_overdue,
+        completion_rate=completion_rate,
+    )
diff --git a/backend/app/api/v1/milestones.py b/backend/app/api/v1/milestones.py
new file mode 100644
index 00000000..ba6ffb60
--- /dev/null
+++ b/backend/app/api/v1/milestones.py
@@ -0,0 +1,94 @@
+import uuid
+
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.core.deps import get_current_user, get_db_session, require_study_member, require_study_roles
+from app.crud import audit as audit_crud
+from app.crud import milestone as milestone_crud
+from app.crud import study as study_crud
+from app.schemas.milestone import MilestoneCreate, MilestoneRead, MilestoneUpdate
+
+router = APIRouter()
+
+
+async def _ensure_study_exists(db: AsyncSession, study_id: uuid.UUID):
+    study = await study_crud.get(db, study_id)
+    if not study:
+        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Study not found")
+    return study
+
+
+@router.post(
+    "/",
+    response_model=MilestoneRead,
+    status_code=status.HTTP_201_CREATED,
+    dependencies=[Depends(require_study_roles(["PM"]))],
+)
+async def create_milestone(
+    study_id: uuid.UUID,
+    milestone_in: MilestoneCreate,
+    db: AsyncSession = Depends(get_db_session),
+    current_user=Depends(get_current_user),
+) -> MilestoneRead:
+    await _ensure_study_exists(db, study_id)
+    milestone = await milestone_crud.create(db, study_id, milestone_in)
+    await audit_crud.log_action(
+        db,
+        study_id=study_id,
+        entity_type="milestone",
+        entity_id=milestone.id,
+        action="CREATE_MILESTONE",
+        detail=f"Milestone {milestone.id} created",
+        operator_id=current_user.id,
+        operator_role=current_user.role,
+    )
+    return milestone
+
+
+@router.get(
+    "/",
+    response_model=list[MilestoneRead],
+    dependencies=[Depends(require_study_member())],
+)
+async def list_milestones(
+    study_id: uuid.UUID,
+    db: AsyncSession = Depends(get_db_session),
+) -> list[MilestoneRead]:
+    await _ensure_study_exists(db, study_id)
+    milestones = await milestone_crud.list_milestones(db, study_id)
+    return list(milestones)
+
+
+@router.patch(
+    "/{milestone_id}",
+    response_model=MilestoneRead,
+    dependencies=[Depends(require_study_roles(["PM"]))],
+)
+async def update_milestone(
+    study_id: uuid.UUID,
+    milestone_id: uuid.UUID,
+    milestone_in: MilestoneUpdate,
+    db: AsyncSession = Depends(get_db_session),
+    current_user=Depends(get_current_user),
+) -> MilestoneRead:
+    await _ensure_study_exists(db, study_id)
+    milestone = await milestone_crud.get(db, milestone_id)
+    if not milestone or milestone.study_id != study_id:
+        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Milestone not found")
+    old_status = milestone.status
+    updated = await milestone_crud.update(db, milestone, milestone_in)
+    detail = None
+    if milestone_in.status and milestone_in.status != old_status:
+        detail = f"milestone {milestone_id} status {old_status} -> {milestone_in.status}"
+    await audit_crud.log_action(
+        db,
+        study_id=study_id,
+        entity_type="milestone",
+        entity_id=milestone_id,
+        action="UPDATE_MILESTONE",
+        detail=detail or "Milestone updated",
+        operator_id=current_user.id,
+        operator_role=current_user.role,
+    )
+    return updated
diff --git a/backend/app/api/v1/router.py b/backend/app/api/v1/router.py
index 45cc9979..de9cf9a6 100644
--- a/backend/app/api/v1/router.py
+++ b/backend/app/api/v1/router.py
@@ -1,6 +1,6 @@
 from fastapi import APIRouter
 
-from app.api.v1 import auth, users, studies, sites, members, comments, attachments, audit_logs
+from app.api.v1 import auth, users, studies, sites, members, comments, attachments, audit_logs, milestones, tasks, dashboard
 
 api_router = APIRouter()
 api_router.include_router(auth.router, prefix="/auth", tags=["auth"])
@@ -11,3 +11,6 @@ api_router.include_router(members.router, prefix="/studies/{study_id}/members",
 api_router.include_router(comments.router, prefix="/studies/{study_id}/{entity_type}/{entity_id}/comments", tags=["comments"])
 api_router.include_router(attachments.router, prefix="/studies/{study_id}/{entity_type}/{entity_id}/attachments", tags=["attachments"])
 api_router.include_router(audit_logs.router, prefix="/studies/{study_id}/audit-logs", tags=["audit-logs"])
+api_router.include_router(milestones.router, prefix="/studies/{study_id}/milestones", tags=["milestones"])
+api_router.include_router(tasks.router, prefix="/studies/{study_id}/tasks", tags=["tasks"])
+api_router.include_router(dashboard.router, prefix="/studies/{study_id}/dashboard", tags=["dashboard"])
diff --git a/backend/app/api/v1/tasks.py b/backend/app/api/v1/tasks.py
new file mode 100644
index 00000000..5cead312
--- /dev/null
+++ b/backend/app/api/v1/tasks.py
@@ -0,0 +1,114 @@
+import uuid
+
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.core.deps import get_current_user, get_db_session, require_study_member, require_study_roles
+from app.crud import audit as audit_crud
+from app.crud import milestone as milestone_crud
+from app.crud import study as study_crud
+from app.crud import task as task_crud
+from app.schemas.task import TaskCreate, TaskRead, TaskUpdate
+
+router = APIRouter()
+
+ALLOW_ASSIGNEE_UPDATE_STATUS = False
+
+
+async def _ensure_study_exists(db: AsyncSession, study_id: uuid.UUID):
+    study = await study_crud.get(db, study_id)
+    if not study:
+        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Study not found")
+    return study
+
+
+async def _validate_milestone(db: AsyncSession, study_id: uuid.UUID, milestone_id: uuid.UUID | None):
+    if milestone_id is None:
+        return
+    milestone = await milestone_crud.get(db, milestone_id)
+    if not milestone:
+        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Milestone not found")
+    if milestone.study_id != study_id:
+        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail="Milestone does not belong to study")
+
+
+@router.post(
+    "/",
+    response_model=TaskRead,
+    status_code=status.HTTP_201_CREATED,
+    dependencies=[Depends(require_study_roles(["PM"]))],
+)
+async def create_task(
+    study_id: uuid.UUID,
+    task_in: TaskCreate,
+    db: AsyncSession = Depends(get_db_session),
+    current_user=Depends(get_current_user),
+) -> TaskRead:
+    await _ensure_study_exists(db, study_id)
+    await _validate_milestone(db, study_id, task_in.milestone_id)
+    task = await task_crud.create(db, study_id, task_in, created_by=current_user.id)
+    await audit_crud.log_action(
+        db,
+        study_id=study_id,
+        entity_type="task",
+        entity_id=task.id,
+        action="CREATE_TASK",
+        detail=f"Task {task.id} created",
+        operator_id=current_user.id,
+        operator_role=current_user.role,
+    )
+    return task
+
+
+@router.get(
+    "/",
+    response_model=list[TaskRead],
+    dependencies=[Depends(require_study_member())],
+)
+async def list_tasks(
+    study_id: uuid.UUID,
+    milestone_id: uuid.UUID | None = None,
+    assignee_id: uuid.UUID | None = None,
+    status: str | None = None,
+    db: AsyncSession = Depends(get_db_session),
+) -> list[TaskRead]:
+    await _ensure_study_exists(db, study_id)
+    tasks = await task_crud.list_tasks(db, study_id, milestone_id=milestone_id, assignee_id=assignee_id, status=status)
+    return list(tasks)
+
+
+@router.patch(
+    "/{task_id}",
+    response_model=TaskRead,
+    dependencies=[Depends(require_study_roles(["PM"]))],
+)
+async def update_task(
+    study_id: uuid.UUID,
+    task_id: uuid.UUID,
+    task_in: TaskUpdate,
+    db: AsyncSession = Depends(get_db_session),
+    current_user=Depends(get_current_user),
+) -> TaskRead:
+    await _ensure_study_exists(db, study_id)
+    task = await task_crud.get(db, task_id)
+    if not task or task.study_id != study_id:
+        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Task not found")
+    if task_in.milestone_id:
+        await _validate_milestone(db, study_id, task_in.milestone_id)
+
+    old_status = task.status
+    updated = await task_crud.update(db, task, task_in)
+    detail = None
+    if task_in.status and task_in.status != old_status:
+        detail = f"task {task_id} status {old_status} -> {task_in.status}"
+    await audit_crud.log_action(
+        db,
+        study_id=study_id,
+        entity_type="task",
+        entity_id=task_id,
+        action="UPDATE_TASK" if not detail else "TASK_STATUS_CHANGE",
+        detail=detail or "Task updated",
+        operator_id=current_user.id,
+        operator_role=current_user.role,
+    )
+    return updated
diff --git a/backend/app/crud/milestone.py b/backend/app/crud/milestone.py
new file mode 100644
index 00000000..3cec213d
--- /dev/null
+++ b/backend/app/crud/milestone.py
@@ -0,0 +1,48 @@
+import uuid
+from typing import Sequence
+
+from sqlalchemy import select, update as sa_update
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.models.milestone import Milestone
+from app.schemas.milestone import MilestoneCreate, MilestoneUpdate
+
+
+async def create(db: AsyncSession, study_id: uuid.UUID, milestone_in: MilestoneCreate) -> Milestone:
+    milestone = Milestone(
+        study_id=study_id,
+        type=milestone_in.type,
+        name=milestone_in.name or milestone_in.type,
+        planned_date=milestone_in.planned_date,
+        actual_date=None,
+        status=milestone_in.status or "NOT_STARTED",
+        owner_id=milestone_in.owner_id,
+        notes=milestone_in.notes,
+    )
+    db.add(milestone)
+    await db.commit()
+    await db.refresh(milestone)
+    return milestone
+
+
+async def get(db: AsyncSession, milestone_id: uuid.UUID) -> Milestone | None:
+    result = await db.execute(select(Milestone).where(Milestone.id == milestone_id))
+    return result.scalar_one_or_none()
+
+
+async def list_milestones(db: AsyncSession, study_id: uuid.UUID) -> Sequence[Milestone]:
+    result = await db.execute(select(Milestone).where(Milestone.study_id == study_id).order_by(Milestone.planned_date))
+    return result.scalars().all()
+
+
+async def update(db: AsyncSession, milestone: Milestone, milestone_in: MilestoneUpdate) -> Milestone:
+    update_data = milestone_in.model_dump(exclude_unset=True)
+    if update_data:
+        await db.execute(
+            sa_update(Milestone)
+            .where(Milestone.id == milestone.id)
+            .values(**update_data)
+        )
+        await db.commit()
+    await db.refresh(milestone)
+    return milestone
diff --git a/backend/app/crud/task.py b/backend/app/crud/task.py
new file mode 100644
index 00000000..9e8ab977
--- /dev/null
+++ b/backend/app/crud/task.py
@@ -0,0 +1,77 @@
+import uuid
+from datetime import datetime, timezone
+from typing import Sequence
+
+from sqlalchemy import select, update as sa_update
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.models.task import Task
+from app.schemas.task import TaskCreate, TaskUpdate
+
+
+async def create(
+    db: AsyncSession,
+    study_id: uuid.UUID,
+    task_in: TaskCreate,
+    *,
+    created_by: uuid.UUID,
+) -> Task:
+    task = Task(
+        study_id=study_id,
+        milestone_id=task_in.milestone_id,
+        title=task_in.title,
+        description=task_in.description,
+        assignee_id=task_in.assignee_id,
+        priority=task_in.priority,
+        due_date=task_in.due_date,
+        status="TODO",
+        created_by=created_by,
+    )
+    db.add(task)
+    await db.commit()
+    await db.refresh(task)
+    return task
+
+
+async def get(db: AsyncSession, task_id: uuid.UUID) -> Task | None:
+    result = await db.execute(select(Task).where(Task.id == task_id))
+    return result.scalar_one_or_none()
+
+
+async def list_tasks(
+    db: AsyncSession,
+    study_id: uuid.UUID,
+    milestone_id: uuid.UUID | None = None,
+    assignee_id: uuid.UUID | None = None,
+    status: str | None = None,
+) -> Sequence[Task]:
+    stmt = select(Task).where(Task.study_id == study_id)
+    if milestone_id:
+        stmt = stmt.where(Task.milestone_id == milestone_id)
+    if assignee_id:
+        stmt = stmt.where(Task.assignee_id == assignee_id)
+    if status:
+        stmt = stmt.where(Task.status == status)
+    stmt = stmt.order_by(Task.due_date)
+    result = await db.execute(stmt)
+    return result.scalars().all()
+
+
+async def update(db: AsyncSession, task: Task, task_in: TaskUpdate) -> Task:
+    update_data = task_in.model_dump(exclude_unset=True)
+    if "status" in update_data:
+        status_change = update_data["status"]
+        if status_change == "DONE":
+            update_data["completed_at"] = datetime.now(timezone.utc)
+        else:
+            update_data["completed_at"] = None
+
+    if update_data:
+        await db.execute(
+            sa_update(Task)
+            .where(Task.id == task.id)
+            .values(**update_data)
+        )
+        await db.commit()
+    await db.refresh(task)
+    return task
diff --git a/backend/app/db/base.py b/backend/app/db/base.py
index f8963b28..71a6b635 100644
--- a/backend/app/db/base.py
+++ b/backend/app/db/base.py
@@ -8,3 +8,5 @@ from app.models.study_member import StudyMember  # noqa: F401
 from app.models.comment import Comment  # noqa: F401
 from app.models.attachment import Attachment  # noqa: F401
 from app.models.audit_log import AuditLog  # noqa: F401
+from app.models.milestone import Milestone  # noqa: F401
+from app.models.task import Task  # noqa: F401
diff --git a/backend/app/models/milestone.py b/backend/app/models/milestone.py
new file mode 100644
index 00000000..ec8030f3
--- /dev/null
+++ b/backend/app/models/milestone.py
@@ -0,0 +1,26 @@
+import uuid
+from datetime import datetime, date
+
+from sqlalchemy import Date, DateTime, ForeignKey, String, Text, func
+from sqlalchemy.dialects.postgresql import UUID
+from sqlalchemy.orm import Mapped, mapped_column
+
+from app.db.base_class import Base
+
+
+class Milestone(Base):
+    __tablename__ = "milestones"
+
+    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
+    study_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("studies.id"), index=True, nullable=False)
+    type: Mapped[str] = mapped_column(String(50), nullable=False)
+    name: Mapped[str] = mapped_column(String(200), nullable=False)
+    planned_date: Mapped[date | None] = mapped_column(Date, nullable=True)
+    actual_date: Mapped[date | None] = mapped_column(Date, nullable=True)
+    status: Mapped[str] = mapped_column(String(20), nullable=False, default="NOT_STARTED")
+    owner_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True), ForeignKey("users.id"), nullable=True)
+    notes: Mapped[str | None] = mapped_column(Text, nullable=True)
+    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False, server_default=func.now())
+    updated_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), nullable=False, server_default=func.now(), onupdate=func.now()
+    )
diff --git a/backend/app/models/task.py b/backend/app/models/task.py
new file mode 100644
index 00000000..3b35e2df
--- /dev/null
+++ b/backend/app/models/task.py
@@ -0,0 +1,28 @@
+import uuid
+from datetime import datetime, date
+
+from sqlalchemy import Date, DateTime, ForeignKey, String, Text, func
+from sqlalchemy.dialects.postgresql import UUID
+from sqlalchemy.orm import Mapped, mapped_column
+
+from app.db.base_class import Base
+
+
+class Task(Base):
+    __tablename__ = "tasks"
+
+    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
+    study_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("studies.id"), index=True, nullable=False)
+    milestone_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True), ForeignKey("milestones.id"), nullable=True)
+    title: Mapped[str] = mapped_column(String(200), nullable=False)
+    description: Mapped[str | None] = mapped_column(Text, nullable=True)
+    assignee_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True), ForeignKey("users.id"), nullable=True)
+    priority: Mapped[str] = mapped_column(String(20), nullable=False, default="MEDIUM")
+    due_date: Mapped[date | None] = mapped_column(Date, nullable=True)
+    status: Mapped[str] = mapped_column(String(20), nullable=False, default="TODO")
+    completed_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
+    created_by: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("users.id"), nullable=False)
+    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False, server_default=func.now())
+    updated_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), nullable=False, server_default=func.now(), onupdate=func.now()
+    )
diff --git a/backend/app/schemas/milestone.py b/backend/app/schemas/milestone.py
new file mode 100644
index 00000000..8a711a7e
--- /dev/null
+++ b/backend/app/schemas/milestone.py
@@ -0,0 +1,39 @@
+import uuid
+from datetime import date, datetime
+from typing import Optional
+
+from pydantic import BaseModel, ConfigDict, Field
+
+
+class MilestoneCreate(BaseModel):
+    type: str
+    name: Optional[str] = None
+    planned_date: Optional[date] = None
+    owner_id: Optional[uuid.UUID] = None
+    notes: Optional[str] = None
+    status: str = Field(default="NOT_STARTED")
+
+
+class MilestoneUpdate(BaseModel):
+    name: Optional[str] = None
+    planned_date: Optional[date] = None
+    actual_date: Optional[date] = None
+    status: Optional[str] = None
+    owner_id: Optional[uuid.UUID] = None
+    notes: Optional[str] = None
+
+
+class MilestoneRead(BaseModel):
+    id: uuid.UUID
+    study_id: uuid.UUID
+    type: str
+    name: str
+    planned_date: Optional[date]
+    actual_date: Optional[date]
+    status: str
+    owner_id: Optional[uuid.UUID]
+    notes: Optional[str]
+    created_at: datetime
+    updated_at: datetime
+
+    model_config = ConfigDict(from_attributes=True)
diff --git a/backend/app/schemas/progress.py b/backend/app/schemas/progress.py
new file mode 100644
index 00000000..31028325
--- /dev/null
+++ b/backend/app/schemas/progress.py
@@ -0,0 +1,10 @@
+from pydantic import BaseModel
+
+
+class StudyProgressRead(BaseModel):
+    milestones_total: int
+    milestones_done: int
+    tasks_total: int
+    tasks_done: int
+    tasks_overdue: int
+    completion_rate: float
diff --git a/backend/app/schemas/task.py b/backend/app/schemas/task.py
new file mode 100644
index 00000000..6816fb9a
--- /dev/null
+++ b/backend/app/schemas/task.py
@@ -0,0 +1,42 @@
+import uuid
+from datetime import date, datetime
+from typing import Optional
+
+from pydantic import BaseModel, ConfigDict
+
+
+class TaskCreate(BaseModel):
+    milestone_id: Optional[uuid.UUID] = None
+    title: str
+    description: Optional[str] = None
+    assignee_id: Optional[uuid.UUID] = None
+    priority: str = "MEDIUM"
+    due_date: Optional[date] = None
+
+
+class TaskUpdate(BaseModel):
+    milestone_id: Optional[uuid.UUID] = None
+    title: Optional[str] = None
+    description: Optional[str] = None
+    assignee_id: Optional[uuid.UUID] = None
+    priority: Optional[str] = None
+    due_date: Optional[date] = None
+    status: Optional[str] = None
+
+
+class TaskRead(BaseModel):
+    id: uuid.UUID
+    study_id: uuid.UUID
+    milestone_id: Optional[uuid.UUID]
+    title: str
+    description: Optional[str]
+    assignee_id: Optional[uuid.UUID]
+    priority: str
+    due_date: Optional[date]
+    status: str
+    completed_at: Optional[datetime]
+    created_by: uuid.UUID
+    created_at: datetime
+    updated_at: datetime
+
+    model_config = ConfigDict(from_attributes=True)
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