Online Evaluation
Definition
Online evaluation assesses new interactions in actual operation.
The evaluation of a system based on newly emerging interactions in live operation, for example through controlled experiments, interleaving, or cautiously limited rollouts.
Simply explained
Under controlled conditions, one observes how a variant performs on real current requests.
Why it matters in practice
Helps realistically assess model quality, limits, and technical decisions.
Example from business
Two ranking variants are compared with limited traffic and safeguard metrics.
Limits and pitfalls
- Interpreting observed live differences causally without appropriate design, experimenting without guardrails, or ignoring novelty effects, sample size, and long-term effects.
Origin & history
Online evaluation has become widespread with web experiments, bandits, and productive recommendation systems.
Use in mid-sized companies
- Possible application: Two ranking variants are compared with limited traffic and safeguard metrics.
Frequently asked questions
What does online evaluation mean?
The evaluation of a system based on newly emerging interactions in live operation, for example through controlled experiments, interleaving, or cautiously limited rollouts.
Which mistakes should be avoided?
Interpreting observed live differences causally without appropriate design, experimenting without guardrails, or ignoring novelty effects, sample size, and long-term effects.
Sources
Source checked on 10.10.2026. Editorial application examples are hypothetical; no evidence of real customer results.
Editorially reviewed on: