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+# Environment operation order
+
+This chapter attempts to document the order of important operations done during environment transitions.
+Since AliECS is an evolving system, the information presented here might be out-of-date, thus please refer to event handling in [core/environment/environment.go](https://github.com/AliceO2Group/Control/blob/master/core/environment/environment.go) and plugin calls in [ControlWorkflows/workflows/readout-dataflow.yaml](https://github.com/AliceO2Group/ControlWorkflows/blob/master/workflows/readout-dataflow.yaml) for the ultimate source of truth.
+Also, please report to the ECS developers any inaccuracies.
+
+[State Machine Callbacks](configuration.md#State-machine-callbacks) documents the order of callbacks that can be associated with state machine transitions.
+
+## START_ACTIVITY (Start Of Run)
+
+This is the order of actions happening at a healthy start of run.
+
+### before_START_ACTIVITY
+
+- `"run_number"` is set.
+- `"run_start_time_ms"` is set using the current time. It is considered as the SOR and SOSOR timestamps.
+- `before_START_ACTIVITY` hooks are executed:
+  - `trg.PrepareForRun()` at `-200`
+  - `trg.RunLoad()`, `bookkeeping.StartOfRun()` at `-100`
+  - `bookkeeping.RetrieveFillInfo()` at `-99`
+  - `kafka.PublishStartActivityUpdate()` at `-50`
+  - `dcs.StartOfRun()`, `odc.Start()` (does not need to return now), `ccdb.RunStart()` at `0`
+
+### leave_CONFIGURED
+
+- `leave_CONFIGURED` hooks are executed
+  - `kafka.PublishLeaveStateUpdate()` at `0`
+
+### Transition START_ACTIVITY
+
+- Fill Info previously retrieved by the BKP plugin is read from the variable stack and put into transition message to tasks
+- Tasks are transitioned to `RUNNING`
+- If everything succeeds up to this point, we report that the run has started
+
+### enter_RUNNING
+
+- `enter_RUNNING` hooks are executed
+  - `o2-roc-ctp-emulator` for all ROC CTP emulator endpoints, `kafka.PublishEnterStateUpdate()` at `0`
+
+### after_START_ACTIVITY
+- `"run_start_completion_time_ms"` is set using current time. It is considered as the EOSOR timestamp.
+- `after_START_ACTIVITY` hooks are executed:
+  - `trg.RunStart()` at `0`
+  - waiting until `odc.Start()` executed at `before_START_ACTIVITY` completes at `0`
+  - `bookkeeping.UpdateRunStart()`, `bookkeeping.UpdateEnv()` at `+100`
+
+## STOP_ACTIVITY (End Of Run)
+
+This is the order of actions happening at a healthy end of run.
+
+### before_STOP_ACTIVITY
+
+- `"run_end_time_ms"` is set using the current time. It is considered as the EOR and SOEOR timestamps.
+- `before_STOP_ACTIVITY` hooks are executed:
+  - `trg.RunStop()`, `odc.Stop()` (does not need to return now) at `0`
+
+### leave_RUNNING
+
+- `leave_RUNNING` hooks are executed
+  - `kafka.PublishLeaveStateUpdate()` at `0`
+
+### Transition STOP_ACTIVITY
+
+- Tasks are transitioned to `CONFIGURED`
+- If everything succeeds up to this point, we consider that the run has stopped
+
+### enter_CONFIGURED
+
+- `enter_CONFIGURED` hooks are executed
+  - `kafka.PublishEnterStateUpdate()` at `0`
+
+### after_STOP_ACTIVITY
+- `"run_end_completion_time_ms"` is set using current time. It is considered as the EOEOR timestamp.
+- `after_STOP_ACTIVITY` hooks are executed:
+  - `trg.RunUnload()` at `-100`
+  - `ccdb.RunStop()`, `dcs.EndOfRun()` at `0`
+  - waiting until `odc.Stop()` executed at `before_STOP_ACTIVITY` completes at `0`
+  - `bookkeeping.UpdateRunStop()`, `bookkeeping.UpdateEnv()` at `+100`
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