Writing a user requirements specification for temperature-controlled equipment
The URS states what the equipment must do in measurable terms. Every later test traces back to it, so vague requirements produce untestable qualifications.
Annex 15 places the URS at the start of the qualification lifecycle: the specification for equipment, facilities, utilities or systems should be defined in a URS and the essential elements of quality built in. A good URS reads like a set of acceptance criteria waiting for tests.
Example requirements for a cold room
- Maintain 2.0–8.0 °C at all product locations during routine use with doors opened up to N times per hour.
- Recover to range within X minutes after a door opening of Y seconds.
- Independent monitoring with calibrated sensors at locations to be defined by mapping; alarm within Z minutes of an excursion.
- Monitoring data retained for at least N years in original form with audit trail.
- Calibration certificates traceable to national standards for all controlling and monitoring sensors.
Each line becomes a test in IQ, OQ or PQ. A requirement that cannot be tested should be rewritten until it can.
Frequently asked questions
- Who owns the URS?
- The user (quality and operations), not the supplier. Suppliers respond to it; they do not write it.
References
- [1]EudraLex Volume 4, Annex 15: Qualification and Validation (2015)
General technical guidance written against the cited sources. It is not regulatory or legal advice and does not replace the applicable standard, guideline or a qualified reviewer's judgement.
Have a question on this topic?
Ask ValiTrac AI and see the evidence and calculation behind the answer.
Ask ValiTrac AIFree calculator: MKT & logger data check
Paste logger readings and get MKT per ICH Q1A(R2) alongside min, max, mean and out-of-limit runs with durations.
Open the calculatorRelated articles
IQ, OQ and PQ explained
Installation, operational and performance qualification are three questions asked in order: is it installed as specified, does it operate across its ranges, does it perform in routine use?
What a validation master plan should contain
The VMP is the site-level statement of validation policy, scope, responsibilities and schedule. It tells an inspector how the organisation decides what to validate and how.