Prompt, RAG or fine-tuning? Diagnose first, in 30 seconds
Silent video: no voiceover, music or sound effects. This transcript repeats every on-screen word and describes each scene.
The film includes the topic label "Prompt, RAG or fine-tuning", the note "Illustrative diagram", the TecnoStack logo and progress numbers 1, 2, 3, 4, 5, 6. Elements enter and leave during transitions; in portrait, the closing sign-off replaces the footer.

[0:00–0:05] Beat 1 of 6 (intro)
Kicker: LLM customization
Headline: Diagnose the failure first
Support: Choose the smallest effective change
Diagram (flow): Failure; Diagnosis; Smallest fix
Connections: Failure → Diagnosis; Diagnosis → Smallest fix
Highlighted: Diagnosis
Scene: Flow: Failure, Diagnosis, Smallest fix. Connections: Failure to Diagnosis; Diagnosis to Smallest fix. Emphasis: Diagnosis.

[0:05–0:10] Beat 2 of 6 (step1)
Kicker: 01
Headline: Check three likely causes
Support: Instructions, knowledge and behavior
Diagram (decision paths): Failure; Instructions; Knowledge; Behavior
Connections: Failure → Instructions; Failure → Knowledge; Failure → Behavior
Highlighted: Instructions
Scene: Branching diagram: Failure, Instructions, Knowledge, Behavior. Connections: Failure to Instructions; Failure to Knowledge; Failure to Behavior. Emphasis: Instructions.

[0:10–0:15] Beat 3 of 6 (step2)
Kicker: 02
Headline: Make instructions testable
Support: Use examples and validated output
Diagram (layered stack): Task; Output schema; Examples; Missing evidence
Connections: Task → Output schema; Output schema → Examples; Examples → Missing evidence
Highlighted: Output schema
Scene: Layered diagram: Task, Output schema, Examples, Missing evidence. Connections: Task to Output schema; Output schema to Examples; Examples to Missing evidence. Emphasis: Output schema.

[0:15–0:20] Beat 4 of 6 (step3)
Kicker: 03
Headline: Supply authorized evidence
Support: Check retrieval before generation
Diagram (flow): Question; Access check; Approved search; Cited answer
Connections: Question → Access check; Access check → Approved search; Approved search → Cited answer
Highlighted: Approved search
Scene: Flow: Question, Access check, Approved search, Cited answer. Connections: Question to Access check; Access check to Approved search; Approved search to Cited answer. Emphasis: Approved search.

[0:20–0:25] Beat 5 of 6 (step4)
Kicker: 04
Headline: Fine-tune for a measured need
Support: Compare alternatives and held-out results
Diagram (timeline): Prompt tested; Alternatives; Training examples; Held-out test
Connections: Prompt tested → Alternatives; Alternatives → Training examples; Training examples → Held-out test
Highlighted: Training examples
Scene: Sequence: Prompt tested, Alternatives, Training examples, Held-out test. Connections: Prompt tested to Alternatives; Alternatives to Training examples; Training examples to Held-out test. Emphasis: Training examples.

[0:25–0:30] Beat 6 of 6 (close)
Kicker: TECNOSTACK
Headline: Re-test every change
Support: Check regressions as well as gains
Diagram (hub and spokes): Test set; Prompt; Retrieval; Tuned model
Connections: Test set → Prompt; Test set → Retrieval; Test set → Tuned model
Highlighted: Test set
Sign-off: TecnoStack logo and tecnostack.com
Scene: Network: Test set, Prompt, Retrieval, Tuned model. Connections: Test set to Prompt; Test set to Retrieval; Test set to Tuned model. Emphasis: Test set.