Under AS9100, work instruction revisions are controlled through documented document-control and change-control processes, not by ad hoc edits on the shop floor. In practice, that means formal review and approval, revision identification, controlled release, removal of obsolete versions, traceable training impact assessment, and objective evidence that only the correct revision was available at point of use.

They should not assume every open job can simply switch to the latest instruction. In-process work needs a controlled disposition based on effectivity, current operation status, product risk, and approval requirements. The practical answer is versioned work instructions, explicit hold-and-review rules, documented rework or deviation paths, and traceable updates across MES, QMS, ERP, and training records.

In general internet slang, “ISM” isn’t a single, stable term, and it is not a standard abbreviation in industrial or regulated manufacturing contexts. In most professional operations, engineering, or quality discussions, “ISM” should be avoided or clarified explicitly to prevent ambiguity and documentation risk.