A technical diagram works when it answers one explicit question, shows the relationships the source supports, and lets a reviewer trace every material visual claim back to evidence.
Choose the question before the visual form
Read the approved report for the audience's decision, then write the single question the diagram must answer. The question may concern sequence, mechanism, comparison, hierarchy, boundary, or change over time. Collect only the claims, terms, relationships, and uncertainty needed for that question. A diagram that tries to summarize the entire report usually hides the structure the audience needs to see.
NASA's information-display guidance emphasizes content focus, comparison, integrity, multiple levels of detail, and close integration with verbal and statistical descriptions. Apply those principles by choosing the visual form from the evidence. Use position, sequence, enclosure, connection, or scale only when the source supports that relationship, and avoid decoration that implies magnitude or causality the report does not claim.
Make the source and limits part of the artifact
Create a claim ledger beside the draft. Each material label, arrow, comparison, and quantity should point to a page, figure, dataset, or approved note. Write a caption that states what the viewer is seeing and an evidence note that distinguishes direct source support from visual interpretation. Add alt text based on the image's purpose and the information needed by someone who cannot see it.
Source-Led Explainer is operated by Reality Contact, LLC. The service prepares the visual from buyer-approved material and returns it for claim review. The buyer remains the authority on technical meaning, data, citations, permissions, and publication. A source-linked diagram can make reasoning inspectable, but it does not validate the underlying research or assure audience comprehension.
Where the service stops
Reality Contact, LLC translates approved material into diagrams and a short explainer, but does not conduct new research, validate scientific truth, approve claims, alter data, provide legal or medical advice, or promise comprehension, persuasion, publication, or audience response. The buyer approves the source corpus, claim boundary, visual brief, diagram drafts, storyboard, narration, and final captures, then decides where and how the finished materials are published or presented. This is visual communication and document preparation, and it does not replace scientific, legal, medical, accessibility, licensing, or professional review. The buyer approves the source corpus, claims, permissions, visual interpretation, narration, and every publication or presentation use.
Sources: NASA principles of information display; W3C guidance for image alternatives.