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diff --git a/resources/libraries/python/MLRsearch/ProgressState.py b/resources/libraries/python/MLRsearch/ProgressState.py
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+++ b/resources/libraries/python/MLRsearch/ProgressState.py
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+# Copyright (c) 2021 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.
+
+"""Module defining ProgressState class."""
+
+
+class ProgressState:
+    """Structure containing data to be passed around in recursion.
+
+    This is basically a private class of MultipleRatioSearch,
+    but keeping it in a separate file makes things more readable.
+    """
+
+    def __init__(
+            self, database, phases, duration, width_goal, packet_loss_ratios,
+            min_rate, max_rate, stop_time):
+        """Convert and store the argument values.
+
+        Also initializa the stored width for external search.
+
+        :param result: Structure containing measured results.
+        :param phases: How many intermediate phases to perform
+            before the current one.
+        :param duration: Trial duration to use in the current phase [s].
+        :param width_goal: The goal relative width for the curreent phase.
+        :param packet_loss_ratios: List of ratios for the current search.
+        :param min_rate: Minimal target transmit rate available
+            for the current search [tps].
+        :param max_rate: Maximal target transmit rate available
+            for the current search [tps].
+        :param stop_time: Monotonic time [s] when we should fail on timeout.
+        :type result: MeasurementDatabase
+        :type phases: int
+        :type duration: float
+        :type width_goal: float
+        :type packet_loss_ratios: Iterable[float]
+        :type min_rate: float
+        :type max_rate: float
+        :type stop_time: float
+        """
+        self.database = database
+        self.phases = int(phases)
+        self.duration = float(duration)
+        self.width_goal = float(width_goal)
+        self.packet_loss_ratios = [
+            float(ratio) for ratio in packet_loss_ratios
+        ]
+        self.min_rate = float(min_rate)
+        self.max_rate = float(max_rate)
+        self.stop_time = float(stop_time)