A system diagram for secondary education at a high level, without any specifics.

high_school_education_system_with_clumps

digraph high_school_sys{
	overlap=scalexy;
	nodesep=0.6;	
	
	subgraph cluster_after{
		label = "After high school";
		"College";
		"Vocational career";
	}

	subgraph cluster_local_system{
		label = "Local education system";
		"School board";
		"PTA";
		"Teachers";
		"Administrators";
		//"Teacher evaluation";
	}

	subgraph cluster_larger_system{
		label = "US education system";
		"State education departments";
		"Standards";
	}	

	subgraph cluster_tools{
		label = "Teacher tools";
		"Grades";
		"Feedback";
		"Curriculum";
		"Textbook";
		subgraph cluster_work{
			label = "Student tasks";
			"Assessment";
			"Projects";
			"Homework";
		}
	}

	node[shape=box,style=filled,color=lightgrey, fillcolor=red] "Students";
	node[shape=ellipse, style=solid]; 
	"Teachers" -> "Students";
	"Administrators" -> "Teachers"; 
	"Curriculum" -> "Teachers";
	"Curriculum" -> "Students";
	"State education departments" -> "Curriculum";
	"State education departments" -> "Assessment";
	"Teachers" -> "Assessment";
	"Assessment" -> "Students";
	"Standards" -> "Assessment";
	"Standards" -> "Curriculum";
	"State education departments" -> "School board";
	"School board" -> "Administrators";
	"School board" -> "Teachers";
	"School board" -> "Teacher evaluation";
	"PTA" -> "School board";
	"Homework" -> "Students";
	"Teachers" -> "Homework";
	"Projects" -> "Students";
	"Teachers" -> "Projects";
	"Students" -> "College";
	"Students" -> "Vocational career";
	"Teacher unions" -> "Teachers";
	"Teacher unions" -> "School board";
	"Home life" -> "Students";
	"Textbook" -> "Curriculum";
	"Curriculum" -> "Textbook";
	"Textbook" -> "Students";
	"Test prep" -> "College";
	"Test prep" -> "Students";
	"Standards" -> "Test prep";
	"Test prep" -> "Assessment";
	"Grades" -> "Students";
	"Teachers" -> "Grades";
	"Projects" -> "Grades";
	"Homework" -> "Grades";
	"Teachers" -> "Feedback";
	"Feedback" -> "Students";
	"Projects" -> "Feedback";
	"Homework" -> "Feedback";

	label="A secondary school education system";
}