diff --git a/category_number_one/service-tasks/service_tasks.bpmn b/category_number_one/service-tasks/service_tasks.bpmn
new file mode 100644
index 00000000..d45e2a31
--- /dev/null
+++ b/category_number_one/service-tasks/service_tasks.bpmn
@@ -0,0 +1,48 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<bpmn:definitions xmlns:bpmn="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlns:dc="http://www.omg.org/spec/DD/20100524/DC" xmlns:di="http://www.omg.org/spec/DD/20100524/DI" id="Definitions_96f6665" targetNamespace="http://bpmn.io/schema/bpmn" exporter="Camunda Modeler" exporterVersion="3.0.0-dev">
+  <bpmn:process id="Process_bd2e724" isExecutable="true">
+    <bpmn:startEvent id="StartEvent_1">
+      <bpmn:outgoing>Flow_0ydmy9a</bpmn:outgoing>
+    </bpmn:startEvent>
+    <bpmn:sequenceFlow id="Flow_0ydmy9a" sourceRef="StartEvent_1" targetRef="service_task_one" />
+    <bpmn:endEvent id="Event_0fy5yvl">
+      <bpmn:incoming>Flow_09h0mla</bpmn:incoming>
+    </bpmn:endEvent>
+    <bpmn:sequenceFlow id="Flow_09h0mla" sourceRef="service_task_one" targetRef="Event_0fy5yvl" />
+    <bpmn:serviceTask id="service_task_one" name="Service Task One">
+      <bpmn:incoming>Flow_0ydmy9a</bpmn:incoming>
+      <bpmn:outgoing>Flow_09h0mla</bpmn:outgoing>
+      <bpmn:extensionElements>
+        <spiffworkflow:serviceTaskOperator id="SlackWebhookOperator">
+          <spiffworkflow:parameters>
+            <spiffworkflow:parameter name="webhook_token" type="string" value="[FIXME]" />
+            <spiffworkflow:parameter name="message" type="string" value="ServiceTask testing" />
+            <spiffworkflow:parameter name="channel" type="string" value="#" />
+          </spiffworkflow:parameters>
+        </spiffworkflow:serviceTaskOperator>
+      </bpmn:extensionElements>
+    </bpmn:serviceTask>
+  </bpmn:process>
+  <bpmndi:BPMNDiagram id="BPMNDiagram_1">
+    <bpmndi:BPMNPlane id="BPMNPlane_1" bpmnElement="Process_bd2e724">
+      <bpmndi:BPMNShape id="_BPMNShape_StartEvent_2" bpmnElement="StartEvent_1">
+        <dc:Bounds x="179" y="159" width="36" height="36" />
+      </bpmndi:BPMNShape>
+      <bpmndi:BPMNShape id="Event_0fy5yvl_di" bpmnElement="Event_0fy5yvl">
+        <dc:Bounds x="432" y="159" width="36" height="36" />
+      </bpmndi:BPMNShape>
+      <bpmndi:BPMNShape id="Activity_1jzqu4s_di" bpmnElement="service_task_one">
+        <dc:Bounds x="270" y="137" width="100" height="80" />
+        <bpmndi:BPMNLabel />
+      </bpmndi:BPMNShape>
+      <bpmndi:BPMNEdge id="Flow_0ydmy9a_di" bpmnElement="Flow_0ydmy9a">
+        <di:waypoint x="215" y="177" />
+        <di:waypoint x="270" y="177" />
+      </bpmndi:BPMNEdge>
+      <bpmndi:BPMNEdge id="Flow_09h0mla_di" bpmnElement="Flow_09h0mla">
+        <di:waypoint x="370" y="177" />
+        <di:waypoint x="432" y="177" />
+      </bpmndi:BPMNEdge>
+    </bpmndi:BPMNPlane>
+  </bpmndi:BPMNDiagram>
+</bpmn:definitions>
diff --git a/category_number_one/service-tasks/workflow.json b/category_number_one/service-tasks/workflow.json
new file mode 100644
index 00000000..d389e768
--- /dev/null
+++ b/category_number_one/service-tasks/workflow.json
@@ -0,0 +1,17 @@
+{
+    "description": "Service Tasks",
+    "display_order": 8,
+    "primary_process_id": "Process_bd2e724",
+    "standalone": false,
+    "is_master_spec": false,
+    "libraries": [],
+    "display_name": "Service Tasks",
+    "library": false,
+    "primary_file_name": "service_tasks.bpmn",
+    "process_group_id": "category_number_one",
+    "id": "service-tasks",
+    "fault_or_suspend_on_exception": "fault",
+    "is_review": false,
+    "files": [],
+    "exception_notification_addresses": []
+}
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