diff --git a/bopytex/actions.py b/bopytex/actions.py
new file mode 100644
index 0000000..89805a4
--- /dev/null
+++ b/bopytex/actions.py
@@ -0,0 +1,27 @@
+def generate():
+    pass
+
+
+def compile():
+    pass
+
+
+def activate_corr():
+    pass
+
+
+def join_pdf():
+    pass
+
+
+def clean():
+    pass
+
+
+ACTIONS = {
+    "GENERATE": generate,
+    "COMPILE": compile,
+    "ACTIVATE_CORR": activate_corr,
+    "JOIN_PDF": join_pdf,
+    "clean": clean,
+}
diff --git a/bopytex/planner.py b/bopytex/planner.py
new file mode 100644
index 0000000..0818129
--- /dev/null
+++ b/bopytex/planner.py
@@ -0,0 +1,63 @@
+""" Produce tasks to do
+
+It essentially place things at the right place and define the way that files are named.
+
+"""
+from dataclasses import dataclass
+
+
+@dataclass
+class Task:
+    action: str
+    args: dict
+    deps: list
+    output: str
+
+
+def generate(template: str, meta: dict):
+    """Create a task to generate a subject"""
+    return Task(
+        action="GENERATE",
+        args=meta,
+        deps=[template],
+        output=meta["subject"] + template[3:],
+    )
+
+
+def activate_corr_on(src: str):
+    """Create a task to activate correction for src"""
+    return Task(
+        action="ACTIVATE_CORR",
+        args={},
+        deps=[src],
+        output="corr_" + src,
+    )
+
+
+def compile_pdf(src: str):
+    """Create a task to compile src"""
+    return Task(
+        action="COMPILE",
+        args={},
+        deps=[src],
+        output=src[:-3] + "pdf"
+    )
+
+def join_pdfs(pdfs: list):
+    """ Create task to join pdf together """
+    return Task(
+        action="JOIN",
+        args={},
+        deps=pdfs,
+        output="joined.pdf"
+    )
+
+
+def clean(files: list):
+    """ Create task to clean files"""
+    return Task(
+        action="CLEAN",
+        args={},
+        deps=files,
+        output=None
+    )
diff --git a/test/__init__.py b/test/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/test/test_planner.py b/test/test_planner.py
new file mode 100644
index 0000000..77b491c
--- /dev/null
+++ b/test/test_planner.py
@@ -0,0 +1,46 @@
+from bopytex.planner import activate_corr_on, clean, compile_pdf, generate, join_pdfs
+
+
+def test_build_task_generate():
+    template = "tpl_source.tex"
+    task = generate(template, {"subject": "01"})
+    assert task.action == "GENERATE"
+    assert task.args == {"subject": "01"}
+    assert task.deps == [template]
+    assert task.output == "01_source.tex"
+
+
+def test_build_task_activate_corr_on():
+    src = "source.tex"
+    task = activate_corr_on(src)
+    assert task.action == "ACTIVATE_CORR"
+    assert task.args == {}
+    assert task.deps == [src]
+    assert task.output == "corr_source.tex"
+
+
+def test_build_task_compile():
+    src = "source.tex"
+    task = compile_pdf(src)
+    assert task.action == "COMPILE"
+    assert task.args == {}
+    assert task.deps == [src]
+    assert task.output == "source.pdf"
+
+
+def test_build_task_join():
+    pdfs = [f"{i}_source.pdf" for i in range(3)]
+    task = join_pdfs(pdfs)
+    assert task.action == "JOIN"
+    assert task.args == {}
+    assert task.deps == pdfs
+    assert task.output == "joined.pdf"
+
+
+def test_build_task_compile():
+    files = ["source.aux", "source.log"]
+    task = clean(files)
+    assert task.action == "CLEAN"
+    assert task.args == {}
+    assert task.deps == files
+    assert task.output is None