diff --git a/assets/img/cisTEM job control.png b/assets/img/cisTEM job control.png
new file mode 100644
index 0000000..eff5e51
Binary files /dev/null and b/assets/img/cisTEM job control.png differ
diff --git a/assets/sequencediagram_io/cisTEM job control(6).txt b/assets/sequencediagram_io/cisTEM job control(6).txt
new file mode 100644
index 0000000..68a424f
--- /dev/null
+++ b/assets/sequencediagram_io/cisTEM job control(6).txt	
@@ -0,0 +1,69 @@
+title cisTEM Job control
+
+
+GUI->*job_control:Launch
+job_control-->GUI:Connect
+GUI-->job_control:**please_identify**
+job_control-->GUI:**sending_identification**
+GUI-->job_control:**you_are_connected**
+job_control-->GUI:**send_job_details**
+GUI-->job_control:**sending_job_package**
+GUI-->job_control: //Job package [Run profile/jobs]//
+
+box over job_control: Launch Server thread
+job_control->*Worker1(Master):Launch
+job_control->*Worker2:Launch
+
+Worker1(Master)-->job_control:Connect
+job_control-->Worker1(Master):**please_identify**
+Worker1(Master)-->job_control:**sending_identification**
+job_control-->Worker1(Master):**you_are_the_master**
+job_control-->Worker1(Master)://Job package//
+box over Worker1(Master): Launch Server thread
+box over Worker1(Master): Launch Worker thread
+
+Worker2-->job_control:Connect
+job_control-->Worker2:**please_identify**
+Worker2-->job_control:**sending_identification**
+job_control-->Worker2:**you_are_a_worker**
+job_control-->Worker2://Master ip and port//
+
+
+Worker2-->Worker1(Master):Connect
+Worker1(Master)-->Worker2:**please_identify**
+Worker2-->Worker1(Master):**sending_identification**
+Worker1(Master)-->Worker2:**you_are_a_connected**
+box over Worker2: Launch Worker thread
+Worker2-->Worker1(Master):**send_next_job**
+Worker2-->Worker1(Master)://dummy result//
+Worker1(Master)-->Worker2:**ready_to_send_single_job**
+Worker1(Master)-->Worker2://Job1//
+
+
+
+Worker2->Worker2:DoCalculation()
+Worker2-->Worker1(Master):**send_next_job**
+Worker2-->Worker1(Master)://Result of Job1//
+
+Worker1(Master)-->job_control:**job_result**
+Worker1(Master)-->job_control://Result of Job1//
+
+job_control-->GUI:**job_result**
+job_control-->GUI://Result of Job1//
+
+Worker1(Master)-->Worker2:**ready_to_send_single_job**
+Worker1(Master)-->Worker2://Job2//
+Worker2->Worker2:DoCalculation()
+Worker2-->Worker1(Master):**send_next_job**
+Worker2-->Worker1(Master)://Result of Job2//
+
+Worker1(Master)-->job_control:**job_result**
+Worker1(Master)-->job_control://Result of Job2//
+
+job_control-->GUI:**job_result**
+job_control-->GUI://Result of Job2//
+
+Worker1(Master)-->Worker2:**time_to_die**
+box over Worker2: Exit
+
+
diff --git a/docs/dev/howto/Utilities/cistem_job_control.md b/docs/dev/howto/Utilities/cistem_job_control.md
new file mode 100644
index 0000000..2029706
--- /dev/null
+++ b/docs/dev/howto/Utilities/cistem_job_control.md
@@ -0,0 +1,7 @@
+# cisTEM Job Control
+
+This diagram shows the rough sequence of events when a cisTEM job is run through the GUI.
+The messages shown in bold are 16-byte control codes defined in `socket_codes.h`. These are usually followed by 16 bytes of information,
+which often encodes the number of bytes of other results to follow (Shown in italics)
+
+[assets/img/cisTEM_job_control.png]
\ No newline at end of file