← All articlesPRACTICAL KNOWLEDGE

Designing a reliable prompt

A reliable prompt specifies task, context, inputs, expected output, boundaries and evaluation criteria clearly enough for outputs to be assessed reproducibly and improved deliberately. The article provides a controlled method, a realistic CTPM practice example and a concrete transfer artefact.

Realistic enterprise scene illustrating Designing a reliable prompt
Short answer

A reliable prompt specifies task, context, inputs, expected output, boundaries and evaluation criteria clearly enough for outputs to be assessed reproducibly and improved deliberately.

What the concept actually means

Role wording alone is insufficient. What matters is a concrete action, relevant data, clear priorities, a defined output format and rules for missing information.

Why it matters in the enterprise

In enterprise use a prompt belongs to a process and accountability model. Version, model, test cases and permitted data must therefore be managed with the text.

A controlled method

The CTPM practice framework for controllable AI applications uses seven stages: understand the task, clarify context and data, apply AI deliberately, review professionally, handle deviations, approve accountably and document transfer. It is a transparent working framework, not a certification.

  • Define task and impact
  • Clarify data, context and permissions
  • Review against domain criteria
  • Control deviations, approval and evidence

CTPM practice example

CTPM practice example: Instead of “summarise the document”, the task names the audience, separates decisions and open points, requires page references for every claim and explicitly marks ambiguity.

Quality and test criteria

The following criteria make quality observable for this use case:

  • Task and success criteria are distinct.
  • Missing data does not trigger invented completion.
  • Output is machine- and human-reviewable.
  • At least one negative and edge case is tested.

Risks and common misconceptions

Long prompts may hide contradictions. Few-shot examples can transfer unwanted patterns. A good prompt cannot compensate for an unsuitable task or poor data.

Example transfer artefact

Transfer artefact: a tested prompt template with task, context, input, output format, quality rules, approval and version.

Sources and references

  1. OpenAI: Prompt engineering guide (2026)
  2. OpenAI: Working with evals (2026)
  3. NIST: Artificial Intelligence Risk Management Framework: Generative Artificial Intelligence Profile (2024)