MedTech Terms
    The authoritative reference
    All terms

    Locked vs. Adaptive Algorithm

    Distinction between models whose behavior is fixed at release vs. those that continue learning.

    Reviewed by Christian Espinosa, Founder, Blue Goat CyberLast reviewed May 5, 2026

    Definition

    A locked algorithm produces the same output for the same input every time after release. An adaptive algorithm changes its behavior over time as it is exposed to new data, either continuously or in scheduled retraining cycles.

    What this means in practice

    FDA's PCCP framework lets manufacturers prospectively define and validate the boundaries of allowable adaptive changes so retraining does not require a new submission for each model update.

    Cross-references

    Uses

    Concepts or artefacts this term builds on.

    Primary references

    3 sources
    Link health: 2 verified 1 bot-blocked· last checked 2026-05-09
    FDA·2MDCG·1
    1. 1
      PCCP Guidance
      Bot-blocked
      FDAfda.gov
    2. 2
      MDCG Software Guidance
      Verified
      MDCGhealth.ec.europa.eu
    3. 3
      FDA - Software as a Medical Device (SaMD)
      Verified
      FDAfda.gov

    Inline markers like [1] jump to the matching reference above.