diff --git a/tools/cross_check/cross_check.sh b/tools/cross_check/cross_check.sh
new file mode 100755
index 00000000..bbb09d00
--- /dev/null
+++ b/tools/cross_check/cross_check.sh
@@ -0,0 +1,254 @@
+#!/bin/bash
+# This script is useful when it is time to find
+# new candidate tests for refstack. It lists
+# all API tests from tempest, designate-tempest-plugin,
+# heat-tempest-plugin and manila tempest-plugin except
+# those that:
+#   * are/were part of interop repository or
+#   * are mentioned in exclude file (see option --exclude-file) or
+#   * are scenario tests or
+#   * require admin access.
+#
+# The list of tests that is produced by this script is
+# good start to find new tests but not all tests listed
+# by the script must necessarily be added to the refstack.
+
+function print_help() {
+     SCRIPT_NAME="basename ${BASH_SOURCE[0]}"
+     echo "Usage: ${SCRIPT_NAME} [OPTION] ..."
+     echo "Find missing test in interop repository."
+     echo ""
+     echo "--interop-url        URL to download interop git repository"
+     echo "--interop-commit     ID of interop commit that should be used"
+     echo "--tempest-url        URL to download tempest git repository"
+     echo "--tempest-commit     ID of tempest commit that should be used"
+     echo "--designate-url      URL to download designate-tempest-plugin git repository"
+     echo "--designate-commit   ID of designate-tempest-plugin commit that should be used"
+     echo "--heat-url           URL to download heat-tempest-plugin"
+     echo "--heat-commit        ID of heat-tempest-plugin commit that should be used"
+     echo "--manila-url         URL to download manila-tempest-plugin"
+     echo "--manila-commit      ID of manila-tempest-plugin commit that should be used"
+     echo "--exclude-file       File that contains tests that should be ignored"
+     echo "                     (Default: ./exclude_file.txt)"
+}
+
+TEMPEST_GIT_URL=https://opendev.org/openstack/tempest.git
+TEMPEST_COMMIT=e64c78dcf720202a0542bb1e1184f5229a11524f
+
+DESIGNATE_GIT_URL=https://opendev.org/openstack/designate-tempest-plugin.git
+DESIGNATE_COMMIT=master
+
+HEAT_GIT_URL=https://opendev.org/openstack/heat-tempest-plugin.git
+HEAT_COMMIT=master
+
+MANILA_GIT_URL=https://opendev.org/openstack/manila-tempest-plugin.git
+MANILA_COMMIT=master
+
+INTEROP_GIT_URL=https://opendev.org/osf/interop.git
+INTEROP_COMMIT=master
+
+TMP_DIR=$(mktemp -d)
+SCRIPTDIR=$(dirname $0)
+EXCLUDE_FILE="${SCRIPTDIR}/exclude_file.txt"
+
+while [[ ! -z "$1" ]]; do
+    case "$1" in
+        --interop-url)
+            INTEROP_GIT_URL="$2";
+            shift 2;;
+        --interop-commit)
+            INTEROP_COMMIT="$2";
+            shift 2;;
+        --tempest-url)
+            TEMPEST_GIT_URL="$2";
+            shift 2;;
+        --tempest-commit)
+            TEMPEST_COMMIT="$2";
+            shift 2;;
+        --designate-url)
+            DESIGNATE_GIT_URL="$2";
+            shift 2;;
+        --designate-commit)
+            DESIGNATE_COMMIT="$2";
+            shift 2;;
+        --heat-url)
+            HEAT_URL="$2";
+            shift 2;;
+        --heat-commit)
+            HEAT_COMMIT="$2";
+            shift 2;;
+        --manila-url)
+            MANILA_URL="$2";
+            shift 2;;
+        --manila-commit)
+            MANILA_COMMIT="$2"
+            shift 2;;
+        --exclude-file)
+            EXCLUDE_FILE="$2";
+            shift 2;;
+        --help)
+            print_help
+            exit;;
+        *)
+            echo "ERROR: Not valid option used ($1)";
+            exit;;
+    esac
+done
+
+if [[ ! -z ${EXCLUDE_FILE} ]] && [[ -f ${EXCLUDE_FILE} ]]; then
+    EXCLUDE_FILE=$(realpath ${EXCLUDE_FILE})
+elif [[ ! -z ${EXCLUDE_FILE} ]] && [[ ! -f ${EXCLUDE_FILE} ]]; then
+    echo "ERROR: Not valid exclude file (${EXCLUDE_FILE})"
+    exit
+else
+    touch ${TMP_DIR}/exclude_file.txt
+    EXCLUDE_FILE="${TMP_DIR}/exclude_file.txt"
+fi
+
+echo "Temporary directory used by cross_check.sh: ${TMP_DIR}"
+
+# Clone repositories
+echo "Cloning interop repository ..."
+git clone --quiet ${INTEROP_GIT_URL} ${TMP_DIR}/interop
+cd ${TMP_DIR}/interop
+git checkout --quiet ${INTEROP_COMMIT}
+cd - &> /dev/null
+
+echo "Cloning tempest repository ..."
+git clone --quiet ${TEMPEST_GIT_URL} ${TMP_DIR}/tempest
+cd ${TMP_DIR}/tempest
+git checkout --quiet ${TEMPEST_COMMIT}
+cd - &> /dev/null
+
+echo "Cloning designate-tempest-plugin repository ..."
+git clone --quiet ${DESIGNATE_GIT_URL} ${TMP_DIR}/designate-tempest-plugin
+cd ${TMP_DIR}/designate-tempest-plugin
+git checkout --quiet ${DESIGNATE_COMMIT}
+cd - &> /dev/null
+
+echo "Cloning heat-tempest-plugin repository ..."
+git clone --quiet ${HEAT_GIT_URL} ${TMP_DIR}/heat-tempest-plugin
+cd ${TMP_DIR}/heat-tempest-plugin
+git checkout --quiet ${HEAT_COMMIT}
+cd - &> /dev/null
+
+echo "Cloning manila-tempest-plugin repository ..."
+git clone --quiet ${MANILA_GIT_URL} ${TMP_DIR}/manila-tempest-plugin
+cd ${TMP_DIR}/manila-tempest-plugin
+git checkout --quiet ${MANILA_COMMIT}
+cd - &> /dev/null
+
+########################################################
+# Find and print missing tests from interop repository.
+#
+# GLOBALS:
+#   TMP_DIR, EXCLUDE_FILE
+# ARGUMENTS:
+#   1 - Path to the repository in which the missing
+#       tests should be found.
+# OUTPUTS:
+#   List of tests that are part of passed repository
+#   but not part of interop and not mentioned in
+#   exclude file.
+#
+#######################################################
+function cross_check() {
+
+    REPO_DIR=$1
+
+    # Get every idempotent id from the repository
+    grep -hr --exclude-dir="doc" "@decorators.idempotent_id('" ${REPO_DIR} \
+        | sed --expression="s/@decorators.idempotent_id('//g" \
+        | sed --expression="s/')//g" \
+        | sed --expression="s/ *//g" \
+        | sort > ${TMP_DIR}/repo_idempotent_ids.txt
+
+    # Get every idempotent id from interop
+    cd ${TMP_DIR}/interop/guidelines
+    cat $(ls -1 | grep -E "[0-9]{4}\.[0-9]{2}\.json|next.json") ${TMP_DIR}/interop/add-ons/guidelines/* \
+        | grep -oE "id-[[:alnum:]]{8}-[[:alnum:]]{4}-[[:alnum:]]{4}-[[:alnum:]]{4}-[[:alnum:]]{12}" \
+        | sed --expression='s/id-//g' \
+        | sort > ${TMP_DIR}/interop_idempotent_ids.txt
+    cd - &> /dev/null
+
+
+    # Get ids of missing tests in interop
+    comm -23 ${TMP_DIR}/repo_idempotent_ids.txt ${TMP_DIR}/interop_idempotent_ids.txt \
+        | sort > ${TMP_DIR}/missing_idempotent_ids.txt
+
+    # Print missing tests to stdout
+    cd ${REPO_DIR}
+    while read ID; do
+        FILE=$(grep -rl "${ID}" && cd - > /dev/null)
+
+        FUNC_NAME=$(sed -e "1,/${ID}/d" ${FILE} \
+                        | grep -m1 "def" \
+                        | sed "s/def//g; s/(.*//g; s/ //g")
+
+        CLASS_NAME=$(sed "/${ID}/q" ${FILE} \
+                        | grep "^class " \
+                        | tail -1 \
+                        | sed "s/class//g; s/(.*//g; s/ //g")
+
+        FILE_ID=$(echo ${FILE} | sed "s/\.py//g; s/\.\///g; s/\//\./g")
+        TEST_NAME="${FILE_ID}.${CLASS_NAME}.${FUNC_NAME}"
+
+        # Check if test:
+        #   * requires admin access or
+        #   * is already present in interop next files
+        #     (necessary for older next files as they do not
+        #     use idempotent ids) or
+        #   * is scenario test or
+        #   * is present in exclude file.
+        ADMIN_TEST=$(echo ${FILE_ID} | grep "\.admin\.")
+        SCENARIO_TEST=$(echo ${FILE_ID} | grep "\.scenario\.")
+        IN_INTEROP=$(grep -r ${TEST_NAME} ${TMP_DIR}/interop)
+        IN_EXCLUDE=$(cat ${EXCLUDE_FILE} | grep "${TEST_NAME}")
+
+        if [[ ! ${IN_INTEROP} ]] && \
+           [[ ! ${ADMIN_TEST} ]] && \
+           [[ ! ${IN_EXCLUDE} ]] && \
+           [[ ! ${SCENARIO_TEST} ]]
+        then
+           echo "${TEST_NAME}[${ID}]"
+        fi
+
+    done < ${TMP_DIR}/missing_idempotent_ids.txt
+    cd - &> /dev/null
+
+}
+
+echo "Searching tempest repository ..."
+cross_check ${TMP_DIR}/tempest > ${TMP_DIR}/tempest_tests.txt
+
+echo "Searching designate-tempest-plugin repository ..."
+cross_check ${TMP_DIR}/designate-tempest-plugin > ${TMP_DIR}/designate_tests.txt
+
+echo "Searching heat-tempest-plugin repository ..."
+cross_check ${TMP_DIR}/heat-tempest-plugin > ${TMP_DIR}/heat_tests.txt
+
+echo "Searching manila-tempest-plugin repository ..."
+cross_check ${TMP_DIR}/manila-tempest-plugin > ${TMP_DIR}/manila_tests.txt
+
+echo "Tempest tests:"
+echo "--------------"
+sort ${TMP_DIR}/tempest_tests.txt
+echo ""
+
+echo "Designate-tempest-plugin tests:"
+echo "-------------------------------"
+sort ${TMP_DIR}/designate_tests.txt
+echo ""
+
+echo "Heat-tempest-plugin tests:"
+echo "--------------------------"
+sort ${TMP_DIR}/heat_tests.txt
+echo ""
+
+echo "Manila-tempest-plugin tests:"
+echo "----------------------------"
+sort ${TMP_DIR}/manila_tests.txt
+
+# Cleanup
+rm -rf ${TMP_DIR}
+
diff --git a/tools/cross_check/exclude_file.txt b/tools/cross_check/exclude_file.txt
new file mode 100644
index 00000000..fe7a91bb
--- /dev/null
+++ b/tools/cross_check/exclude_file.txt
@@ -0,0 +1,20 @@
+# This file is used by cross_check.sh script. It contains list of tests
+# that should be ignored by the script. Each test (or group of tests) should
+# be accompanied by a comment explaining why the test should be ignored.
+
+# Tests marked as deprecated (see: https://review.opendev.org/c/osf/interop/+/800795/)
+tempest.api.compute.floating_ips.test_floating_ips_actions.FloatingIPsAssociationTestJSON.test_associate_already_associated_floating_ip
+tempest.api.compute.floating_ips.test_floating_ips_actions.FloatingIPsAssociationTestJSON.test_associate_disassociate_floating_ip
+tempest.api.compute.floating_ips.test_floating_ips_actions.FloatingIPsTestJSON.test_allocate_floating_ip
+tempest.api.compute.floating_ips.test_floating_ips_actions.FloatingIPsTestJSON.test_delete_floating_ip
+tempest.api.compute.floating_ips.test_floating_ips_actions_negative.FloatingIPsAssociationNegativeTestJSON.test_associate_ip_to_server_with_floating_ip
+tempest.api.compute.floating_ips.test_floating_ips_actions_negative.FloatingIPsAssociationNegativeTestJSON.test_associate_ip_to_server_without_passing_floating_ip
+tempest.api.compute.floating_ips.test_floating_ips_actions_negative.FloatingIPsAssociationNegativeTestJSON.test_associate_nonexistent_floating_ip
+tempest.api.compute.floating_ips.test_floating_ips_actions_negative.FloatingIPsAssociationNegativeTestJSON.test_dissociate_nonexistent_floating_ip
+tempest.api.compute.floating_ips.test_floating_ips_actions_negative.FloatingIPsNegativeTestJSON.test_allocate_floating_ip_from_nonexistent_pool
+tempest.api.compute.floating_ips.test_floating_ips_actions_negative.FloatingIPsNegativeTestJSON.test_delete_nonexistent_floating_ip
+tempest.api.compute.floating_ips.test_list_floating_ips.FloatingIPDetailsTestJSON.test_get_floating_ip_details
+tempest.api.compute.floating_ips.test_list_floating_ips.FloatingIPDetailsTestJSON.test_list_floating_ip_pools
+tempest.api.compute.floating_ips.test_list_floating_ips.FloatingIPDetailsTestJSON.test_list_floating_ips
+tempest.api.compute.floating_ips.test_list_floating_ips_negative.FloatingIPDetailsNegativeTestJSON.test_get_nonexistent_floating_ip_details
+