diff --git a/system/__init__.py b/system/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/system/system.yml b/system/system.yml
new file mode 100644
index 0000000..98ef7e9
--- /dev/null
+++ b/system/system.yml
@@ -0,0 +1,59 @@
+# nml -> normal
+# brd -> board
+# ss -> subsystem
+# ass -> assembly
+# ctrl -> controller
+# dh -> device handler
+# All uppermost system components are automatically subsystems
+system:
+  eps:
+    pcdu:
+      id: 0x00000001
+    acu:
+      id: 0x00000002
+    pdu1:
+      id: 0x00000003
+    pdu2:
+  tcs:
+    tcs-ctrl:
+    tcs-brd-ass:
+  acs:
+    acs-brd-ass:
+    sus-brd-ass:
+    tcs-brd-ass:
+    acs-ctrl:
+    rw:
+    mgt:
+    str:
+  payload:
+    scex:
+    ploc:
+    cam-ss:
+    pl-pcdu-ss:
+  com:
+    syrlinks-dh:
+
+
+modes:
+  detumble:
+    system:
+      eps: nml
+        pcdu: nml
+        acu: nml
+        pdu1: nml
+        pdu2: nml
+
+  safe:
+    submodes:
+      cold: 1
+  idle:
+    submodes:
+      charge: 1
+  target-gs:
+  target-gs-pl-dac:
+  target-gs-pl-cam:
+  target-gs-pl-data:
+  earth-obsw:
+  scex:
+
+transitions: