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diff --git a/resources/libraries/bash/entry/tox/model_version.sh b/resources/libraries/bash/entry/tox/model_version.sh
new file mode 100644
index 0000000000..2bcc628bfb
--- /dev/null
+++ b/resources/libraries/bash/entry/tox/model_version.sh
@@ -0,0 +1,65 @@
+# Copyright (c) 2022 Cisco and/or its affiliates.
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at:
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -exuo pipefail
+
+# This file should be executed from tox, as the assumed working directory
+# is different from where this file is located.
+# This file does not have executable flag nor shebang,
+# to dissuade non-tox callers.
+
+# This script runs a two grep commands as "if" conditions,
+# using log files to store the data (generated by git commands) to grep,
+# failing when model implementation edits do not come with model version edit.
+# The contents of the log files may be useful when fail cause is not obvious.
+
+# "set -eu" handles failures from the following two lines.
+BASH_CHECKS_DIR="$(dirname $(readlink -e "${BASH_SOURCE[0]}"))"
+BASH_FUNCTION_DIR="$(readlink -e "${BASH_CHECKS_DIR}/../../function")"
+source "${BASH_FUNCTION_DIR}/common.sh" || {
+    echo "Source failed." >&2
+    exit 1
+}
+
+impl_log="edited_files.log"
+git diff --name-only HEAD~ > "${impl_log}"
+if ! grep -q '^docs/model/current/schema/test_case*' "${impl_log}"; then
+    # Failing grep means no model edits.
+    warn "No model implementation edits detected."
+    warn
+    warn "CSIT model version checker: PASS"
+    exit 0
+fi
+const_log="constants_edits.log"
+git diff -U0 HEAD~ -- "resources/libraries/python/Constants.py" > "${const_log}"
+if ! grep -q '^\+    MODEL_VERSION = ' "${const_log}"; then
+    warn "Model implementation edits without version edit detected!"
+    warn "See ${impl_log} and ${const_log} for what was detected."
+    warn
+    warn "CSIT model version checker: FAIL"
+    exit 1
+fi
+doc_log="docs_edits.log"
+git diff -U0 HEAD~ -- "docs/model/current/top.rst" > "${doc_log}"
+if ! grep -q '^\+This document is valid for CSIT model' "${doc_log}"; then
+    warn "Model implementation edits without documentation update detected!"
+    warn "See ${impl_log}, ${const_log} and ${doc_log} for what was detected."
+    warn
+    warn "CSIT model version checker: FAIL"
+    exit 1
+fi
+# TODO: Check constants and docs are specifying the same version.
+warn "Model version and doc are edited, model implementation edits are allowed."
+warn
+warn "CSIT model version checker: PASS"
+exit 0