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diff --git a/SA_POP/PlanStrategy.h b/SA_POP/PlanStrategy.h
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+// -*- C++ -*-
+// $Id$
+
+//=============================================================================
+/**
+ * @file  PlanStrategy.h
+ *
+ * This file contains the PlanStrategy abstract base class definition for
+ * the high-level planning algorithm.
+ *
+ * @author  John S. Kinnebrew <john.s.kinnebrew@vanderbilt.edu>
+ */
+//=============================================================================
+
+#ifndef SA_POP_PLAN_STRATEGY_H_
+#define SA_POP_PLAN_STRATEGY_H_
+
+#include "SA_POP_Types.h"
+#include "PlanCommands.h"
+
+namespace SA_POP {
+
+  // Forward declaration of Planner.
+  class Planner;
+
+  /**
+   * @class PlanStrategy
+   *
+   * @brief  Abstract base class for the high-level planning/scheduling
+   *         algorithm.
+   */
+  class PlanStrategy {
+  public:
+    /// Constructor.
+    /**
+     * @param planner  Planner object to use.
+     */
+    PlanStrategy (SA_POP::Planner *planner)
+      : planner_ (planner) { };
+
+    /// Destructor.
+    virtual ~PlanStrategy (void) { };
+
+
+
+    // ************************************************************************
+    // Planning methods.
+    // ************************************************************************
+
+    /// Set goals.
+    /**
+     * @param goals  Set of goals and associated utilities.
+     */
+    virtual void set_goals (GoalMap goals) = 0;
+
+    /// Get command ID to use for next command.
+    /**
+     * @return  Command ID to use for next command.
+     */
+    virtual CommandID get_next_cmd_id (void) = 0;
+
+    /// Recursively satisfy all open conditions (including recursive
+    /// scheduling constraint satisfaction through call back).
+    /**
+     * @return  True if all open conditions were satisfied, false otherwise.
+     */
+    virtual bool satisfy_open_conds (void) = 0;
+
+
+    // ************************************************************************
+    // Methods for obtaining prototypes of commands that work on this strategy.
+    // ************************************************************************
+
+    /// Get a PlanCommand prototype for adding open conditions,
+    /// which works on this strategy.
+    /**
+     * @return  An AddOpenCondsCmd prototype for this strategy.
+     */
+    virtual AddOpenCondsCmd *get_AddOpenCondsCmd (void) = 0;
+
+    /// Get a PlanCommand prototype for removing open conditions,
+    /// which works on this strategy.
+    /**
+     * @return  A RemoveOpenCondsCmd prototype for this strategy.
+     */
+    virtual RemoveOpenCondsCmd *get_RemoveOpenCondsCmd (void) = 0;
+
+    /// Get an command prototype for adding causal link threats, which works on
+    /// this strategy.
+    /**
+     * @return  An AddOpenThreatsCmd prototype for this strategy.
+     */
+    virtual AddOpenThreatsCmd *get_AddOpenThreatsCmd (void) = 0;
+
+    /// Get a PlanCommand prototype for removing causal link threats,
+    /// which works on this strategy.
+    /**
+     * @return  A RemoveOpenThreatsCmd prototype for this strategy.
+     */
+    virtual RemoveOpenThreatsCmd *get_RemoveOpenThreatsCmd (void) = 0;
+
+  protected:
+    /// Pointer to Planner object.
+    SA_POP::Planner *planner_;
+
+  };
+
+};  /* SA_POP namespace */
+
+#endif /* SA_POP_PLAN_STRATEGY_H_ */