digraph DP
	{
rankdir=TB;
graph [fontname = "Helvetica"];
node [fontname = "Helvetica" ];

/* {rank=same: IDEA FEASIBILITY "SKETCH \n DESIGN" "DETAIL \n DESIGN";} */
/* {rank=same: problem need "revision \n renewal";} */
/* {ran=same: "essential \n details" ;} */
/* {rank=same: specifications sketches ;} */
/* {rank=same:  approval decision ;} */
/* {rank=same: "user \n testing"  "user \n feedback";} */
/* {rank=same:  implementation documentation} */
 
		/* inception */
	subgraph cluster0 {
		node [];
		color = white;
		IDEA[sides=4,color=black];
		problem -> IDEA;
		need -> IDEA;
		"revision \n renewal" -> IDEA;
		IDEA -> i_sketches;
		
	}

		/* feasibility */
	subgraph cluster1 {
		node [];
		color = white;
		FEASIBILITY[shape=box];		
		"essential \n details" -> FEASIBILITY;
		FEASIBILITY -> specifications[style=bold];
		specifications -> FEASIBILITY;
		
	}

		/* sketch design */
	subgraph cluster2 {
		node [];
		color = white;
		"SKETCH \n DESIGN"[shape=box];
		sketches -> "SKETCH \n DESIGN"[style=bold];
		
	}

		/* approval and decision */
	subgraph cluster3 {
		node [];
		color = white;
		approval -> decision[style=bold];
		
	}

		/* user testing */
	subgraph cluster5 {
		node [];
		color = white;
		"user \n testing" -> "user \n feedback";
		
	}


		/* user testing */
	subgraph cluster6 {
		node [];
		color = white;
		"DETAIL \n DESIGN" [shape=box];
		"DETAIL \n DESIGN" -> implementation;
		"DETAIL \n DESIGN" -> documentation;
		
	}

 
		IDEA -> FEASIBILITY [style=bold,weight=1];
		 i_sketches ->  FEASIBILITY;
		FEASIBILITY -> sketches[style=bold];
		"SKETCH \n DESIGN" -> approval[style=bold,weight=8];
		approval -> specifications[style=dotted];
		"SKETCH \n DESIGN" -> "user \n testing"[style=dashed];
		"user \n feedback" -> approval[style=dashed];
		decision -> "DETAIL \n DESIGN"[style=bold];
		specifications -> "SKETCH \n DESIGN"[style=dotted];
		specifications -> "essential \n details"[style=dotted];

	}