1 files changed, 26 insertions, 0 deletions
diff --git a/doc/01-Scope.rst b/doc/01-Scope.rst
new file mode 100644
index 0000000..2f791eb
--- /dev/null
+++ b/doc/01-Scope.rst
@@ -0,0 +1,26 @@
+Scope
+-----
+
+| This document describes the user requirements on the smooth upgrade
+  function of the NFVI and VIM with respect to the upgrades of the OPNFV
+  platform from one version to another. Smooth upgrade means that the
+  upgrade results in no service outage for the end-users. This requires
+  that the process of the upgrade is automatically carried out by a tool
+  (code name: Escalator) with pre-configured data. The upgrade process
+  includes preparation, validation, execution, monitoring and
+  conclusion.
+| ==[MT] While it is good to have a tool for the entire upgrade process,
+  but it is a challenging task, so maybe we shouldn't require automation
+  for the entire process right away. Automation is essential at
+  execution.==
+| ==[hujie] Maybe we can analysis information flows of the upgrade tool,
+  abstract the basic / essential actions from the tool (or tools), and
+  map them to a command set of NFVI / VIM's interfaces.==
+
+The requirements are defined in a stepwise approach, i.e. in the first
+phase focusing on the upgrade of the VIM then widening the scope to the
+NFVI.
+
+The requirements may apply to different NFV functions (NFVI, or VIM, or
+both of them) . They will be classified in the Appendix of this
+document.
+\ No newline at end of file