# Counter C00149: Poison the monitoring & evaluation data * **Summary**: Includes Pollute the AB-testing data feeds: Polluting A/B testing requires knowledge of MOEs and MOPs. A/B testing must be caught early when there is relatively little data available so infiltration of TAs and understanding of how content is migrated from testing to larger audiences is fundamental. * **Playbooks**: * **Metatechnique**: M008 - data pollution * **Resources needed:** * **Belongs to tactic stage**: TA12 | Actor types | Sectors | | ----------- | ------- | | Counters these Tactics | | ---------------------- | | Counters these Techniques | | ------------------------- | | [T0020 Trial content](../../generated_pages/techniques/T0020.md) | | [T0046 Use Search Engine Optimization](../../generated_pages/techniques/T0046.md) | | [T0057 Organize Events](../../generated_pages/techniques/T0057.md) | | Seen in incidents | | ----------------- | DO NOT EDIT ABOVE THIS LINE - PLEASE ADD NOTES BELOW