Leave the reasoning
with the revision.

Give a concept, drawing, model, or note a clear identifier and date. When several versions exist, distinguish the current version from earlier material without erasing the history. A later reader should be able to tell which version a discussion or observation refers to.

For an illustrative container insert, a revised drawing might change the spacing between compartments. Keeping the earlier drawing and a brief reason for the adjustment makes the change understandable. Without that connection, a difference in dimensions may be mistaken for an error.

Record the question considered, the information reviewed, and the choice made. Separate direct observations from interpretations or preferences. If a decision depends on an assumption, keep that assumption visible rather than presenting it as a confirmed result.

A short record might say that a layout was revised to improve access in a particular demonstration, while durability was not examined. The qualification is part of the decision's meaning. It should remain attached when the record is summarized or passed to another person.

A useful handover identifies unresolved points, missing information, and the next decision that needs attention. It should also explain where supporting files are kept and who is responsible for maintaining them.

Keep only information appropriate to the purpose and the people who need access. Confidential designs, participant details, and other sensitive material may require separate handling arrangements. A general development note is not a substitute for those arrangements. The aim is a record that is clear enough to continue from, without making unsupported claims about what has been established.