def do_GET_condition(self) -> dict[str, object]:
         """Show Condition of ?id=."""
         id_ = self.params.get_int_or_none('id')
-        return {'condition': Condition.by_id(self.conn, id_, create=True)}
+        c = Condition.by_id(self.conn, id_, create=True)
+        ps = Process.all(self.conn)
+        return {'condition': c,
+                'enabled_processes': [p for p in ps if c in p.conditions],
+                'disabled_processes': [p for p in ps if c in p.blockers],
+                'enabling_processes': [p for p in ps if c in p.enables],
+                'disabling_processes': [p for p in ps if c in p.disables]}
 
     def do_GET_condition_titles(self) -> dict[str, object]:
         """Show title history of Condition of ?id=."""
 
 <td><textarea name="description">{{condition.description.newest|e}}</textarea>{% if condition.id_ %} [<a href="condition_descriptions?id={{condition.id_}}">history</a>]{% endif %}</td>
 <tr/>
 
+<tr>
+<th>enables</th>
+<td>
+{% for process in enabled_processes %}
+<a href="process?id=process.id_">{{process.title.newest|e}}</a><br />
+{% endfor %}
+</td>
+</tr>
+
+<tr>
+<th>disables</th>
+<td>
+{% for process in disabled_processes %}
+<a href="process?id=process.id_">{{process.title.newest|e}}</a><br />
+{% endfor %}
+</td>
+</tr>
+
+<tr>
+<th>enabled by</th>
+<td>
+{% for process in enabling_processes %}
+<a href="process?id=process.id_">{{process.title.newest|e}}</a><br />
+{% endfor %}
+</td>
+</tr>
+
+<tr>
+<th>disabled by</th>
+<td>
+{% for process in disabling_processes %}
+<a href="process?id=process.id_">{{process.title.newest|e}}</a><br />
+{% endfor %}
+</td>
+</tr>
+
 </table>
 {{ macros.edit_buttons() }}
 {% endblock %}