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diff --git a/course/semester2/pprog/assignment1/single-thread/nbody.h b/course/semester2/pprog/assignment1/single-thread/nbody.h
index fc19d059..a0415748 100644
--- a/course/semester2/pprog/assignment1/single-thread/nbody.h
+++ b/course/semester2/pprog/assignment1/single-thread/nbody.h
@@ -17,10 +17,33 @@
 
 #define SINGLE_THREADED
 
-//These macros will be undefined by the multithreaded versions
-#define Simulation_Run(argc, argv) (Graphics_Run(argc, argv)) //Sets up the simulation; in multithreaded versions, will spawn threads
+// --- The below macros will be undefined by the multithreaded versions, and replaced with functions --- //
+
+//Sets up the simulation; in multithreaded versions, will spawn threads
+#define Simulation_Run(argc, argv) \
+if (options.draw_graphics) \
+	Graphics_Run(argc, argv); \
+else \
+{ \
+	while (ExitCondition() == false) \
+	{ BeforeDraw(); AfterDraw(); } \
+}
+
 #define QuitProgram(error) (runstate = (error == true) ? QUIT : QUIT_ERROR) //Prepares to exit program, is thread safe in multithreaded versions
 
+//Macro to be overwritten in multithreaded versions, called before the graphics is allowed to draw anything
+#define BeforeDraw() \
+if (options.verbosity != 0 && universe.steps % options.verbosity == 1) \
+	DisplayStatistics(); \
+System_Compute(&universe);
+
+
+
+//Macro to be overwritten in multithreaded versions, called after the graphics has finished drawing.
+#define AfterDraw()	
+
+// --- Constants and other Macros --- //	
+
 #define M_PI        3.14159265358979323846264338327950288   /* pi */
 #define G 6.67428E-11
 #define DELTA_T 0.05
@@ -71,9 +94,11 @@ typedef struct
 	const char * output; // file to write final positions / velocities of bodies to
 	const char * program; // program name
 	unsigned num_threads; // number of worker threads to spawn (must be greater than 1 for any to be spawned)
+	unsigned nested_threads; // number of threads to nest computations with (must be greater than 1 for any to be spawned)
 	unsigned num_steps; // number of steps to run before stopping (run indefinately if equal to zero)
 	unsigned timeout; // number of seconds to run before stopping (run indefinately if equal to zero)
 	bool draw_graphics; // whether or not to actually draw graphics
+	bool pedantic_graphics; // whether the graphics thread will synchronise with the computation thread (true) or just draw as fast as possible (false)
 	bool print_positions; // print positions of bodies to stdout on every step
 	unsigned verbosity; // print statistics every number of steps indicated by this variable
 	clock_t start_clock;  // clock cycles done when simulation starts