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diff --git a/src/main/java/sevenUnitsGUI/Presenter.java b/src/main/java/sevenUnitsGUI/Presenter.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.function.Function;
+import java.util.function.Predicate;
+
+import sevenUnits.unit.UnitDatabase;
+import sevenUnits.unit.UnitPrefix;
+import sevenUnits.utils.UncertainDouble;
+
+/**
+ * An object that handles interactions between the view and the backend code
+ * 
+ * @author Adrien Hopkins
+ * @since 2021-12-15
+ */
+public final class Presenter {
+	/**
+	 * The view that this presenter communicates with
+	 */
+	private final View view;
+	
+	/**
+	 * The database that this presenter communicates with (effectively the model)
+	 */
+	private final UnitDatabase database;
+	
+	// ====== SETTINGS ======
+	
+	/**
+	 * The rule used for parsing input numbers. Any number-string inputted into
+	 * this program will be parsed using this method.
+	 */
+	private Function<String, UncertainDouble> numberParsingRule;
+	
+	/**
+	 * The rule used for displaying the results of unit conversions. The result
+	 * of unit conversions will be put into this function, and the resulting
+	 * string will be used in the output.
+	 */
+	private Function<UncertainDouble, String> numberDisplayRule;
+	
+	/**
+	 * A predicate that determines whether or not a certain combination of
+	 * prefixes is allowed. If it returns false, a combination of prefixes will
+	 * not be allowed. Prefixes are put in the list from right to left.
+	 */
+	private Predicate<List<UnitPrefix>> prefixRepetitionRule;
+	
+	/**
+	 * If this is true, views that show units as a list will have metric units
+	 * removed from the From unit list and imperial/USC units removed from the To
+	 * unit list.
+	 */
+	private boolean oneWayConversion;
+	
+	/**
+	 * If this is false, duplicate units will be removed from the unit view in
+	 * views that show units as a list to choose from.
+	 */
+	private boolean showDuplicateUnits;
+	
+	/**
+	 * Creates a Presenter
+	 * 
+	 * @param view the view that this presenter communicates with
+	 * @since 2021-12-15
+	 */
+	public Presenter(View view) {
+		this.view = view;
+		this.database = new UnitDatabase();
+	}
+	
+	/**
+	 * Sets the dimension of the view's From and To units.
+	 * 
+	 * @throws UnsupportedOperationException if the view does not support
+	 *                                       unit-based conversion (does not
+	 *                                       implement
+	 *                                       {@link UnitConversionView})
+	 * @since 2021-12-15
+	 */
+	public void applyDimensionFilter() {}
+	
+	/**
+	 * Gets settings from the view and applies them to both view and presenter.
+	 * 
+	 * @since 2021-12-15
+	 */
+	public void applySettings() {}
+	
+	/**
+	 * Converts from the view's input expression to its output expression.
+	 * Displays an error message if any of the required fields are invalid.
+	 * 
+	 * @throws UnsupportedOperationException if the view does not support
+	 *                                       expression-based conversion (does
+	 *                                       not implement
+	 *                                       {@link ExpressionConversionView})
+	 * @since 2021-12-15
+	 */
+	public void convertExpressions() {}
+	
+	/**
+	 * Converts from the view's input unit to its output unit. Displays an error
+	 * message if any of the required fields are invalid.
+	 * 
+	 * @throws UnsupportedOperationException if the view does not support
+	 *                                       unit-based conversion (does not
+	 *                                       implement
+	 *                                       {@link UnitConversionView})
+	 * @since 2021-12-15
+	 */
+	public void convertUnits() {}
+	
+	/**
+	 * Loads settings from the user's settings file and applies them to the view.
+	 * 
+	 * @since 2021-12-15
+	 */
+	public void loadSettings() {}
+	
+	/**
+	 * Gets user settings from the view then saves them to the user's settings
+	 * file.
+	 * 
+	 * @since 2021-12-15
+	 */
+	public void saveSettings() {}
+}