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2. Electrochemical machining - Wikipedia

   en.wikipedia.org/wiki/Electrochemical_machining

   Electrochemical machining (ECM) is a method of removing metal by an electrochemical process. It is normally used for mass production and for working extremely hard materials , or materials that are difficult to machine using conventional methods. [ 1 ]

3. Electronic control unit - Wikipedia

   en.wikipedia.org/wiki/Electronic_control_unit

   Extensive testing and validation activities are carried out as part of the Production part approval process to gain the confidence of the hardware and software. On-board diagnostics or OBD help provide specific data related to which system or component failed or caused a failure during run time and help perform repairs.

4. Verification and validation - Wikipedia

   en.wikipedia.org/wiki/Verification_and_validation

   Verification is intended to check that a product, service, or system meets a set of design specifications. [6] [7] In the development phase, verification procedures involve performing special tests to model or simulate a portion, or the entirety, of a product, service, or system, then performing a review or analysis of the modeling results.

5. Engine control unit - Wikipedia

   en.wikipedia.org/wiki/Engine_control_unit

   An engine control unit (ECU), also called an engine control module (ECM), [1] is a device that controls various subsystems of an internal combustion engine.

6. Error correction model - Wikipedia

   en.wikipedia.org/wiki/Error_correction_model

   If both are I(0), standard regression analysis will be valid. If they are integrated of a different order, e.g. one being I(1) and the other being I(0), one has to transform the model. If they are both integrated to the same order (commonly I(1)), we can estimate an ECM model of the form

7. Environmental stress screening - Wikipedia

   en.wikipedia.org/wiki/Environmental_stress_screening

   For explosive devices, test requirements and methods are tailored from MIL-HDBK-1512 and NATO AOP-7. For batteries, guidance on test requirements is in RCC-Doc-319-99. Note: Surveillance Testing is a periodic repeat of the Acceptance Testing using trending or accelerated aging to authorize shelf life extensions.