diff --git a/bopytex/planner/fake_planner.py b/bopytex/planner/fake_planner.py
new file mode 100644
index 0000000..380e23f
--- /dev/null
+++ b/bopytex/planner/fake_planner.py
@@ -0,0 +1,9 @@
+from bopytex.tasks import Task
+
+
+def simple(options: dict) -> list[Task]:
+    """Simple planner with options['quantity'] tasks and no dependencies"""
+    return [
+        Task("Do", args={"number": i}, deps=[], output=f"{i}")
+        for i in range(options["quantity"])
+    ]
diff --git a/bopytex/service.py b/bopytex/service.py
index 5bb2b3a..723af4f 100755
--- a/bopytex/service.py
+++ b/bopytex/service.py
@@ -5,75 +5,22 @@
 Producing then compiling templates
 """
 
-import csv
-import os
 from bopytex.actions import ACTIONS
-
-from bopytex.planner import only_corr_planner, default_planner
 from bopytex.scheduler import Scheduler
 
 
-def build_subject_list_from_infos(infos: list[dict]) -> list[dict]:
-    subjects = []
-    digit = len(str(len(infos)))
-    for i, infos in enumerate(infos):
-        subjects.append({"number": str(i + 1).zfill(digit), **infos})
-    return subjects
-
-
-def build_subject_list_from_qty(qty: int) -> list[dict]:
-    subjects = []
-    digit = len(str(qty))
-    for i in range(qty):
-        subjects.append({"number": str(i + 1).zfill(digit)})
-    return subjects
-
-
-def build_subjects(students_csv, quantity_subjects):
-    if students_csv:
-        with open(students_csv, "r") as csv_file:
-            infos = csv.DictReader(csv_file)
-        return build_subject_list_from_infos(infos)
-
-    return build_subject_list_from_qty(quantity_subjects)
-
-
-def list_files(dir=".", accept=lambda _: True, reject=lambda _: False):
-    tex_files = []
-    for file in os.listdir(dir):
-        if accept(file) and not reject(file):
-            tex_files.append(file)
-    return tex_files
-
-
-def bopytex(
-    template: str,
-    students_csv: str,
-    quantity_subjects: int,
-    corr: bool,
-    only_corr: bool,
-    no_join: bool,
-    no_pdf: bool,
+def orcherstrator(
+    options: dict,
+    planner,
     actions: dict = ACTIONS,
 ):
+    tasks = planner(options)
 
-    if only_corr:
-        tex_files = list_files(
-            accept=lambda x: x.endswith(".tex"),
-            reject=lambda x: x.startswith("tpl_"),
-        )
-        tasks = only_corr_planner(sources=tex_files, no_pdf=no_pdf, no_join=no_join)
-    else:
-        subjects = build_subjects(
-            students_csv=students_csv, quantity_subjects=quantity_subjects
-        )
-        tasks = default_planner(template, subjects, corr, no_join, no_pdf)
-
-    scheduler = Scheduler([template])
+    scheduler = Scheduler([options["template"]])
     scheduler.append(tasks)
 
-    for task in scheduler.backlog:
-        pass
+    for task in scheduler.backlog():
+        yield task
 
 
 # -----------------------------
diff --git a/test/test_service.py b/test/test_service.py
index d8303c5..bf200be 100644
--- a/test/test_service.py
+++ b/test/test_service.py
@@ -1,33 +1,10 @@
-from bopytex.service import build_subject_list_from_infos, build_subject_list_from_qty
+from bopytex.planner import fake_planner
+from bopytex.service import orcherstrator
+from bopytex.tasks import Task
 
 
-def test_build_subject_list_from_qty():
-    subjects = build_subject_list_from_qty(10)
-    assert subjects == [
-        {"number": "01"},
-        {"number": "02"},
-        {"number": "03"},
-        {"number": "04"},
-        {"number": "05"},
-        {"number": "06"},
-        {"number": "07"},
-        {"number": "08"},
-        {"number": "09"},
-        {"number": "10"},
-    ]
-
-
-def test_build_subject_list_from_infos():
-    infos = [
-        {"name": "test1", "date": "today"},
-        {"name": "test2", "date": "tomorow"},
-    ]
-    subjects = build_subject_list_from_infos(infos)
-    assert subjects == [
-        {"name": "test1", "date": "today", "number": "1"},
-        {"name": "test2", "date": "tomorow", "number": "2"},
-    ]
-
-
-def test_bopytex():
-    pass
+def test_service():
+    options = {"quantity": 3, "template": "tpl_src.tex"}
+    service = orcherstrator(options, fake_planner.simple)
+    for i, task in enumerate(service):
+        assert task == Task("Do", args={"number": i}, deps=[], output=f"{i}")