diff --git a/sandbox/mutable_schedule_object.py b/sandbox/mutable_schedule_object.py
new file mode 100644
index 0000000..f2cf288
--- /dev/null
+++ b/sandbox/mutable_schedule_object.py
@@ -0,0 +1,70 @@
+#!/usr/bin/python
+
+"""
+Muteable Schedule Object
+"""
+
+from bacpypes.debugging import bacpypes_debugging, ModuleLogger
+from bacpypes.consolelogging import ArgumentParser
+
+from bacpypes.primitivedata import Unsigned
+from bacpypes.constructeddata import ArrayOf
+from bacpypes.basetypes import DailySchedule
+from bacpypes.object import WritableProperty, ScheduleObject, register_object_type
+
+# some debugging
+_debug = 0
+_log = ModuleLogger(globals())
+
+#
+#   MyScheduleObject
+#
+
+@register_object_type(vendor_id=999)
+class MyScheduleObject(ScheduleObject):
+
+    properties = [
+        WritableProperty('weeklySchedule', ArrayOf(DailySchedule)),
+        WritableProperty('priorityForWriting', Unsigned),
+        ]
+
+    def __init__(self, **kwargs):
+        if _debug: MyScheduleObject._debug("__init__ %r", kwargs)
+        ScheduleObject.__init__(self, **kwargs)
+
+#
+#
+#
+
+# parse the command line arguments
+parser = ArgumentParser(usage=__doc__)
+args = parser.parse_args()
+
+if _debug: _log.debug("initialization")
+if _debug: _log.debug("    - args: %r", args)
+
+# create a schedule object
+mso = MyScheduleObject(
+    objectIdentifier=('schedule', 1),
+    objectName="myScheduleObject",
+    weeklySchedule=[],
+    priorityForWriting=1,
+    )
+
+print("getting value")
+print(mso.priorityForWriting)
+print("")
+
+print("setting value")
+mso.priorityForWriting = 2
+print("")
+
+print("reading value")
+value = mso.ReadProperty('priorityForWriting')
+print("{}".format(value))
+print("")
+
+print("writing value")
+mso.WriteProperty('priorityForWriting', 3)
+print("")
+