diff --git a/M4893.md b/M4893.md
index 3cbf66e..68b2046 100644
--- a/M4893.md
+++ b/M4893.md
@@ -1,6 +1,6 @@
 ESC-P
 ## Documents
-### Test requirements specification
+### Test Intake / DUT Test Scope
 Define targets and assumptions before design:
 - DUT part number and revision
 - DUT dimensions
@@ -9,12 +9,38 @@ Define targets and assumptions before design:
 - Environmental requirements
 - Acceptance criteria
 - Required customer inputs
-### Test strategy
-Decide which faults are caught where and what access is required, put in a matrix:
-- Net/feature
-- Risk
-- Access method
-- Test stage?
-- Expected limit
+### Test Requirements Specification
+Lists all Customer Requirements, derived System Requirements, and resulting Test Requirements (what the tester must verify). Optionally Test System Requirements (what the tester must be capable of)
+### Test procedure specification
+Describes the test flow in high-level pseudocode.
+### Test Design Specification
+- Mechanical design
+- Electrical design
+- Electrical interface
 - Instrumentation
-- Unresolved issues
\ No newline at end of file
+- Calibration/self-test
+- Spare parts
+- Supported DUT revisions
+### Validation protocol + report
+Defines what will be checked. The report records what happend.
+For example:
+- Remove testing pins to simulate 0V on power pins
+- Short testing pins to simulate short-circuits or excessive load.
+- Test known bad boards
+### Operator instruction
+Instruction for the operator on how to setup and execute the test:
+- fixture photo
+- DUT orientation
+- barcode/serial scan step
+- instruments/external tools
+- start button
+- pass/fail indication
+- what to do on fail
+- when to call test engineering
+- cleaning instruction
+- common failure messages
+### Maintenance guide
+- Daily
+- On start/end of batch
+- Yearly
+- After 10.000 cycles
\ No newline at end of file