diff --git a/modules/axelor-open-suite/axelor-qvm/src/main/java/com.axelor/apps.qvm/service/OperationService.java b/modules/axelor-open-suite/axelor-qvm/src/main/java/com.axelor/apps.qvm/service/OperationService.java
new file mode 100644
index 00000000..e3e85259
--- /dev/null
+++ b/modules/axelor-open-suite/axelor-qvm/src/main/java/com.axelor/apps.qvm/service/OperationService.java
@@ -0,0 +1,38 @@
+/*
+ * Axelor Business Solutions
+ *
+ * Copyright (C) 2019 Axelor (<http://axelor.com>).
+ *
+ * This program is free software: you can redistribute it and/or  modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.axelor.apps.qvm.service;
+
+import com.axelor.apps.base.db.Company;
+import com.axelor.apps.qvm.db.Operation;
+import com.axelor.exception.AxelorException;
+import com.google.inject.persist.Transactional;
+
+public interface OperationService {
+
+    @Transactional
+    public Operation createCalibrationSeq(Company company) throws AxelorException;
+
+    @Transactional
+    public Operation createQualificationSeq(Company company) throws AxelorException;
+
+    @Transactional
+    public Operation createOperationSeq(Company company) throws AxelorException;
+
+    @Transactional
+    public Operation setMachine(Operation operation) throws AxelorException;
+}