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diff --git a/resources/libraries/python/MLRsearch/relevant_bounds.py b/resources/libraries/python/MLRsearch/relevant_bounds.py
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+++ b/resources/libraries/python/MLRsearch/relevant_bounds.py
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+# Copyright (c) 2023 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 RelevantBounds class."""
+
+from __future__ import annotations
+
+from dataclasses import dataclass
+from typing import Optional
+
+from .trimmed_stat import TrimmedStat
+
+
+@dataclass
+class RelevantBounds:
+    """Container for the pair of relevant bounds for a target.
+
+    If there is no valid bound, None is used.
+
+    Relevant upper bound is smallest load acting as an upper bound.
+    Relevant lower bound acts as a lower bound, has to be strictly smaller
+    than the relevant upper bound, and is largest among such loads.
+
+    The short names "clo" and "chi" are also commonly used
+    in logging and technical comments.
+
+    Trimming could be done here, but it needs to known the target explicitly,
+    so it is done in MeasurementDatabase instead.
+    """
+
+    clo: Optional[TrimmedStat]
+    """The relevant lower bound (trimmed) for the current target."""
+    chi: Optional[TrimmedStat]
+    """The relevant upper bound (trimmed) for the current target."""
+
+    # TODO: Check types in post init?
+
+    def __str__(self) -> str:
+        """Convert into a short human-readable string.
+
+        :returns: The short string.
+        :rtype: str
+        """
+        clo = int(self.clo) if self.clo else None
+        chi = int(self.chi) if self.chi else None
+        return f"clo={clo},chi={chi}"