diff --git a/src/lib.rs b/src/lib.rs
index fd9d95a..5827b28 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,3 +1,4 @@
 pub mod framework;
 pub mod body;
 pub mod instruction;
+pub mod timelines;
diff --git a/src/timelines.rs b/src/timelines.rs
new file mode 100644
index 0000000..6268f48
--- /dev/null
+++ b/src/timelines.rs
@@ -0,0 +1,47 @@
+type ORDER = u32;
+
+pub struct Tracker {
+	order: ORDER,
+}
+
+pub struct TimelineInstruction<I>{
+	pub order: ORDER,//absolute ordering of instructions which can be used for sorting even when there are multiple simultaneous timestamps
+	pub instruction: crate::instruction::TimedInstruction<I>,
+}
+
+pub struct Timeline<I>{
+	instructions: std::collections::VecDeque<TimelineInstruction<I>>,
+	trackers: Vec<Tracker>,//wrong
+}
+
+impl<I> Timeline<I>{
+	pub fn new() -> Self {
+		Self{
+			instructions:std::collections::VecDeque::<TimelineInstruction<I>>::new(),
+			trackers:Vec::<Tracker>::new(),
+		}
+	}
+
+	pub fn len(&self) -> usize {
+		return self.instructions.len()
+	}
+	pub fn first(&self) -> Option<&TimelineInstruction<I>> {
+		return self.instructions.get(0)
+	}
+	pub fn last(&self) -> Option<&TimelineInstruction<I>> {
+		return self.instructions.get(self.instructions.len()-1)
+	}
+	pub fn append(&mut self,instruction:TimelineInstruction<I>){
+		let i=self.instructions.len();
+		self.instructions.push_back(instruction);
+		for tracker in self.trackers.iter() {
+			tracker.set_active(true);
+		}
+	}
+	pub fn get_index_after_time(&mut self,time:crate::body::TIME) -> usize{
+		self.instructions.partition_point(|ins|ins.instruction.time<time)
+	}
+	pub fn get_index_after_order(&mut self,order:ORDER) -> usize{
+		self.instructions.partition_point(|ins|ins.order<order)
+	}
+}
\ No newline at end of file