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diff --git a/game/server/NextBot/NextBotComponentInterface.h b/game/server/NextBot/NextBotComponentInterface.h
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+++ b/game/server/NextBot/NextBotComponentInterface.h
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+// NextBotComponentInterface.h
+// Interface for all components
+// Author: Michael Booth, May 2006
+//========= Copyright Valve Corporation, All rights reserved. ============//
+
+#ifndef _NEXT_BOT_COMPONENT_INTERFACE_H_
+#define _NEXT_BOT_COMPONENT_INTERFACE_H_
+
+#include "NextBotEventResponderInterface.h"
+
+class INextBot;
+class Path;
+class CGameTrace;
+class CTakeDamageInfo;
+
+
+//--------------------------------------------------------------------------------------------------------------------------
+/**
+ * Various processes can invoke a "reply" (ie: callback) via instances of this interface
+ */
+class INextBotReply
+{
+public:
+	virtual void OnSuccess( INextBot *bot )  { }						// invoked when process completed successfully
+
+	enum FailureReason
+	{
+		DENIED,
+		INTERRUPTED,
+		FAILED
+	};
+	virtual void OnFail( INextBot *bot, FailureReason reason ) { }		// invoked when process failed
+};
+
+
+//--------------------------------------------------------------------------------------------------------------------------
+/**
+ * Next Bot component interface
+ */
+class INextBotComponent : public INextBotEventResponder
+{
+public:
+	INextBotComponent( INextBot *bot );
+	virtual ~INextBotComponent() { }
+
+	virtual void Reset( void )	{ m_lastUpdateTime = 0; m_curInterval = TICK_INTERVAL; }				// reset to initial state
+	virtual void Update( void ) = 0;									// update internal state
+	virtual void Upkeep( void ) { }										// lightweight update guaranteed to occur every server tick
+
+	inline bool ComputeUpdateInterval();								// return false is no time has elapsed (interval is zero)
+	inline float GetUpdateInterval();
+
+	virtual INextBot *GetBot( void ) const  { return m_bot; }
+	
+private:
+	float m_lastUpdateTime;
+	float m_curInterval;
+
+	friend class INextBot;
+	
+	INextBot *m_bot;
+	INextBotComponent *m_nextComponent;									// simple linked list of components in the bot
+};
+
+
+inline bool INextBotComponent::ComputeUpdateInterval() 
+{ 
+	if ( m_lastUpdateTime ) 
+	{ 
+		float interval = gpGlobals->curtime - m_lastUpdateTime;
+
+		const float minInterval = 0.0001f;
+		if ( interval > minInterval )
+		{
+			m_curInterval = interval;
+			m_lastUpdateTime = gpGlobals->curtime;
+			return true;
+		}
+
+		return false;
+	}
+
+	// First update - assume a reasonable interval.
+	// We need the very first update to do work, for cases
+	// where the bot was just created and we need to propagate
+	// an event to it immediately.
+	m_curInterval = 0.033f;
+	m_lastUpdateTime = gpGlobals->curtime - m_curInterval;
+
+	return true;
+}
+
+inline float INextBotComponent::GetUpdateInterval() 
+{ 
+	return m_curInterval; 
+}
+
+#endif // _NEXT_BOT_COMPONENT_INTERFACE_H_