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diff --git a/api/logic/BaseVersionList.h b/api/logic/BaseVersionList.h
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+/* Copyright 2013-2015 MultiMC Contributors
+ *
+ * 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.
+ */
+
+#pragma once
+
+#include <QObject>
+#include <QVariant>
+#include <QAbstractListModel>
+
+#include "BaseVersion.h"
+#include "tasks/Task.h"
+#include "multimc_logic_export.h"
+
+/*!
+ * \brief Class that each instance type's version list derives from.
+ * Version lists are the lists that keep track of the available game versions
+ * for that instance. This list will not be loaded on startup. It will be loaded
+ * when the list's load function is called. Before using the version list, you
+ * should check to see if it has been loaded yet and if not, load the list.
+ *
+ * Note that this class also inherits from QAbstractListModel. Methods from that
+ * class determine how this version list shows up in a list view. Said methods
+ * all have a default implementation, but they can be overridden by plugins to
+ * change the behavior of the list.
+ */
+class MULTIMC_LOGIC_EXPORT BaseVersionList : public QAbstractListModel
+{
+	Q_OBJECT
+public:
+	enum ModelRoles
+	{
+		VersionPointerRole = Qt::UserRole,
+		VersionRole,
+		VersionIdRole,
+		ParentGameVersionRole,
+		RecommendedRole,
+		LatestRole,
+		TypeRole,
+		BranchRole,
+		PathRole,
+		ArchitectureRole,
+		SortRole
+	};
+	typedef QList<int> RoleList;
+
+	explicit BaseVersionList(QObject *parent = 0);
+
+	/*!
+	 * \brief Gets a task that will reload the version list.
+	 * Simply execute the task to load the list.
+	 * The task returned by this function should reset the model when it's done.
+	 * \return A pointer to a task that reloads the version list.
+	 */
+	virtual Task *getLoadTask() = 0;
+
+	//! Checks whether or not the list is loaded. If this returns false, the list should be
+	//loaded.
+	virtual bool isLoaded() = 0;
+
+	//! Gets the version at the given index.
+	virtual const BaseVersionPtr at(int i) const = 0;
+
+	//! Returns the number of versions in the list.
+	virtual int count() const = 0;
+
+	//////// List Model Functions ////////
+	virtual QVariant data(const QModelIndex &index, int role) const;
+	virtual int rowCount(const QModelIndex &parent) const;
+	virtual int columnCount(const QModelIndex &parent) const;
+	virtual QHash<int, QByteArray> roleNames() const override;
+
+	//! which roles are provided by this version list?
+	virtual RoleList providesRoles() const;
+
+	/*!
+	 * \brief Finds a version by its descriptor.
+	 * \param The descriptor of the version to find.
+	 * \return A const pointer to the version with the given descriptor. NULL if
+	 * one doesn't exist.
+	 */
+	virtual BaseVersionPtr findVersion(const QString &descriptor);
+
+	/*!
+	 * \brief Gets the latest stable version from this list
+	 */
+	virtual BaseVersionPtr getLatestStable() const;
+
+	/*!
+	 * \brief Gets the recommended version from this list
+	 * If the list doesn't support recommended versions, this works exactly as getLatestStable
+	 */
+	virtual BaseVersionPtr getRecommended() const;
+
+	/*!
+	 * Sorts the version list.
+	 */
+	virtual void sortVersions() = 0;
+
+protected
+slots:
+	/*!
+	 * Updates this list with the given list of versions.
+	 * This is done by copying each version in the given list and inserting it
+	 * into this one.
+	 * We need to do this so that we can set the parents of the versions are set to this
+	 * version list. This can't be done in the load task, because the versions the load
+	 * task creates are on the load task's thread and Qt won't allow their parents
+	 * to be set to something created on another thread.
+	 * To get around that problem, we invoke this method on the GUI thread, which
+	 * then copies the versions and sets their parents correctly.
+	 * \param versions List of versions whose parents should be set.
+	 */
+	virtual void updateListData(QList<BaseVersionPtr> versions) = 0;
+};