```
+---+
| 1 |
+---------------+ |
| Leverandør | |
+---------------+ |
| |
+---+
|
V
+----------+
| Kjøp |
| Bestill |
+----------+
|
V
+-----------------------------------+
| Lagerstyringssystem |
+-----------------------------------+
|
V
+------------------------+
| Produktkatalog |
+------------------------+
|
V
+-----------------------------------+
| Delsystem for lagerkontroll |
+-----------------------------------+
```
