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diff --git a/src/main/java/sevenUnitsGUI/UnitConversionView.java b/src/main/java/sevenUnitsGUI/UnitConversionView.java
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+++ b/src/main/java/sevenUnitsGUI/UnitConversionView.java
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+/**
+ * Copyright (C) 2021 Adrien Hopkins
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package sevenUnitsGUI;
+
+import java.util.List;
+import java.util.Optional;
+
+import sevenUnits.unit.BaseDimension;
+import sevenUnits.unit.Unit;
+import sevenUnits.utils.NamedObjectProduct;
+import sevenUnits.utils.ObjectProduct;
+
+/**
+ * A View that supports single unit-based conversion
+ * 
+ * @author Adrien Hopkins
+ * @since 2021-12-15
+ */
+public interface UnitConversionView extends View {
+	/**
+	 * @return unit to convert <em>from</em>
+	 * @since 2021-12-15
+	 */
+	Optional<Unit> getFromSelection();
+	
+	/**
+	 * @return value to convert between the units (specifically, the numeric
+	 *         string provided by the user)
+	 * @since 2021-12-15
+	 */
+	Optional<String> getInputValue();
+	
+	/**
+	 * @return selected dimension
+	 * @since 2021-12-15
+	 */
+	Optional<ObjectProduct<BaseDimension>> getSelectedDimension();
+	
+	/**
+	 * @return unit to convert <em>to</em>
+	 * @since 2021-12-15
+	 */
+	Optional<Unit> getToSelection();
+	
+	/**
+	 * Sets the available dimensions for filtering.
+	 *
+	 * @param dimensions dimensions to use
+	 * @since 2021-12-15
+	 */
+	void setDimensions(List<NamedObjectProduct<BaseDimension>> dimensions);
+	
+	/**
+	 * Sets the available units to convert from. {@link #getFromSelection} is not
+	 * required to use one of these units; this method is to be used for views
+	 * that allow the user to select units from a list.
+	 *
+	 * @param units units to convert from
+	 * @since 2021-12-15
+	 */
+	void setFromUnits(List<? extends Unit> units);
+	
+	/**
+	 * Sets the available units to convert to. {@link #getToSelection} is not
+	 * required to use one of these units; this method is to be used for views
+	 * that allow the user to select units from a list.
+	 *
+	 * @param units units to convert to
+	 * @since 2021-12-15
+	 */
+	void setToUnits(List<? extends Unit> units);
+	
+	/**
+	 * Shows the output of a unit conversion.
+	 * 
+	 * @param outputString string that shows output of conversion
+	 * @since 2021-12-24
+	 */
+	void showUnitConversionOutput(String outputString);
+}