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diff --git a/resources/libraries/python/MLRsearch/search_goal.py b/resources/libraries/python/MLRsearch/search_goal.py
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+++ b/resources/libraries/python/MLRsearch/search_goal.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 SearchGoal class."""
+
+from dataclasses import dataclass
+
+
+@dataclass(frozen=True, eq=True)
+class SearchGoal:
+    """This is the part of controller inputs that can be repeated
+    with different values. MLRsearch saves time by searching
+    for conditional throughput for each goal at the same time,
+    compared to repeated calls with separate goals.
+
+    Most fields (called attributes) of this composite
+    are relevant to the definition of conditional throughput.
+    The rest does not, but can affect the overal search time.
+    """
+
+    loss_ratio: float = 0.0
+    """The goal loss ratio.
+    A trial can satisfy the goal only when its trial loss ratio is not higher
+    than this. See MeasurementResult.loss_ratio for details.
+    A trial that does not satisfy this goal is called a bad trial."""
+    exceed_ratio: float = 0.5
+    """What portion of the duration sum can consist of bad trial seconds
+    while still being classified as lower bound (assuming no short trials)."""
+    relative_width: float = 0.005
+    """Target is achieved when the relevant lower bound
+    is no more than this (in units of the tightest upper bound) far
+    from the relevant upper bound."""
+    initial_trial_duration: float = 1.0
+    """Shortest trial duration employed when searching for this goal."""
+    final_trial_duration: float = 1.0
+    """Longest trial duration employed when searching for this goal."""
+    duration_sum: float = 20.0
+    """Minimal sum of durations of relevant trials sufficient to declare a load
+    to be upper or lower bound for this goal."""
+    preceding_targets: int = 2
+    """Number of increasingly coarser search targets to insert,
+    hoping to speed up searching for the final target of this goal."""
+    expansion_coefficient: int = 2
+    """External search multiplies width (in logarithmic space) by this."""
+    fail_fast: bool = True
+    """If true and min load is not an upper bound, raise.
+    If false, search will return None instead of lower bound."""
+
+    def __post_init__(self) -> None:
+        """Convert fields to correct types and call validate."""
+        super().__setattr__("loss_ratio", float(self.loss_ratio))
+        super().__setattr__("exceed_ratio", float(self.exceed_ratio))
+        super().__setattr__("relative_width", float(self.relative_width))
+        super().__setattr__(
+            "final_trial_duration", float(self.final_trial_duration)
+        )
+        super().__setattr__(
+            "initial_trial_duration", float(self.initial_trial_duration)
+        )
+        super().__setattr__("duration_sum", float(self.duration_sum))
+        super().__setattr__("preceding_targets", int(self.preceding_targets))
+        super().__setattr__(
+            "expansion_coefficient", int(self.expansion_coefficient)
+        )
+        super().__setattr__("fail_fast", bool(self.fail_fast))
+        self.validate()
+
+    def validate(self) -> None:
+        """Make sure the initialized values conform to requirements.
+
+        :raises ValueError: If a field value is outside allowed bounds.
+        """
+        if self.loss_ratio < 0.0:
+            raise ValueError(f"Loss ratio cannot be negative: {self}")
+        if self.loss_ratio >= 1.0:
+            raise ValueError(f"Loss ratio must be lower than 1: {self}")
+        if self.exceed_ratio < 0.0:
+            raise ValueError(f"Exceed ratio cannot be negative: {self}")
+        if self.exceed_ratio >= 1.0:
+            raise ValueError(f"Exceed ratio must be lower than 1: {self}")
+        if self.relative_width <= 0.0:
+            raise ValueError(f"Relative width must be positive: {self}")
+        if self.relative_width >= 1.0:
+            raise ValueError(f"Relative width must be less than 1: {self}")
+        if self.initial_trial_duration <= 0.0:
+            raise ValueError(f"Initial trial duration must be positive: {self}")
+        if self.final_trial_duration < self.initial_trial_duration:
+            raise ValueError(
+                f"Single duration max must be at least initial: {self}"
+            )
+        if self.duration_sum < self.final_trial_duration:
+            raise ValueError(
+                "Min duration sum cannot be smaller"
+                f" than final trial duration: {self}"
+            )
+        if self.expansion_coefficient <= 1:
+            raise ValueError(f"Expansion coefficient is too small: {self}")
+        too_small = False
+        if self.preceding_targets < 0:
+            too_small = True
+        elif self.preceding_targets < 1:
+            if self.initial_trial_duration < self.duration_sum:
+                too_small = True
+        if too_small:
+            raise ValueError(
+                f"Number of preceding targets is too small: {self}"
+            )