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Teachers recorded their planning time in a weekly diary for ten weeks. Teachers in the comparison group spent 3.3 hours a week preparing lessons and resources, and teachers with Aila spent about 2.5 hours. That is a saving of 0.8 hours, or 48.6 minutes, a week. Six independent teacher-reviewers judged that the quality of Aila lesson resources was no worse. Aila was used for only 7% of lessons in an average week, and use declined over the trial. Diary data were missing for 10.3% of teachers. 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Reviewers judged that quality was no worse.","account":"Oak National Academy built Aila, a lesson assistant for teachers in England, on OpenAI's GPT-4o large language model. The Education Endowment Foundation funded a trial, and the National Foundation for Educational Research (NFER) evaluated it independently. In autumn term 2025, 464 teachers of Years 3 to 6 in 108 schools were randomly assigned, school by school, to an Aila group or a comparison group. Both groups could use other generative AI tools. Teachers recorded their planning time in a weekly diary for ten weeks. Teachers in the comparison group spent 3.3 hours a week preparing lessons and resources, and teachers with Aila spent about 2.5 hours. That is a saving of 0.8 hours, or 48.6 minutes, a week. Six independent teacher-reviewers judged that the quality of Aila lesson resources was no worse. Aila was used for only 7% of lessons in an average week, and use declined over the trial. Diary data were missing for 10.3% of teachers. NFER published the report in October 2026, and the report gives the finding a high security rating."}},"provenance":{"kind":"legacy_record","basis":"Editorial assignment.","record_fields":["summary","account"],"source_refs":[]},"review_state":"record_mapped","coverage":"partial"},"systems[].autonomy_permissions":{"state":"unresolved","provenance":{"kind":"curatorial","basis":"Editorial assignment.","record_fields":[],"source_refs":[]},"reason":"This is an explicit unresolved assignment: the sources on record do not settle this question.","review_state":"not_assessed","coverage":"partial"},"systems[].component_role":{"state":"unresolved","provenance":{"kind":"curatorial","basis":"Editorial assignment.","record_fields":[],"source_refs":[]},"reason":"This is an explicit unresolved assignment: the sources on record do not settle this question.","review_state":"not_assessed","coverage":"partial"},"systems[].deployment_configuration":{"state":"unresolved","provenance":{"kind":"curatorial","basis":"Editorial assignment.","record_fields":[],"source_refs":[]},"reason":"This is an explicit unresolved assignment: the sources on record do not settle this question.","review_state":"not_assessed","coverage":"partial"},"systems[].inputs_outputs":{"state":"unresolved","provenance":{"kind":"curatorial","basis":"Editorial assignment.","record_fields":[],"source_refs":[]},"reason":"This is an explicit unresolved assignment: the sources on record do not settle this question.","review_state":"not_assessed","coverage":"partial"},"systems[].model_name":{"state":"unresolved","provenance":{"kind":"curatorial","basis":"Editorial assignment.","record_fields":[],"source_refs":[]},"reason":"This is an explicit unresolved assignment: the sources on record do not settle this question.","review_state":"not_assessed","coverage":"partial"},"systems[].model_version":{"state":"value_present","value":{"kind":"record_fields","fields":{"model_version":"GPT-4o"}},"provenance":{"kind":"legacy_record","basis":"Editorial assignment.","record_fields":["model_version"],"source_refs":[]},"review_state":"record_mapped","coverage":"partial"},"systems[].product_name":{"state":"value_present","value":{"kind":"record_fields","fields":{"system":"Aila, Oak National Academy's AI lesson assistant"}},"provenance":{"kind":"legacy_record","basis":"Editorial assignment.","record_fields":["system"],"source_refs":[]},"review_state":"record_mapped","coverage":"partial"},"systems[].provider":{"state":"unresolved","provenance":{"kind":"curatorial","basis":"Editorial assignment.","record_fields":[],"source_refs":[]},"reason":"This is an explicit unresolved assignment: the sources on record do not settle this question.","review_state":"not_assessed","coverage":"partial"},"taxonomy_crosswalks[]":{"state":"unresolved","provenance":{"kind":"curatorial","basis":"Editorial assignment.","record_fields":[],"source_refs":[]},"reason":"This is an explicit unresolved assignment: the sources on record do not settle this question.","review_state":"not_assessed","coverage":"partial"},"title":{"state":"value_present","value":{"kind":"record_fields","fields":{"title":"NFER finds that primary teachers given Oak National Academy's Aila in an EEF trial spent 76% as much time on lesson preparation","headline":"*Aila* cuts primary teachers' lesson preparation time by about a quarter"}},"provenance":{"kind":"legacy_record","basis":"Editorial assignment.","record_fields":["title","headline"],"source_refs":[]},"review_state":"record_mapped","coverage":"partial"},"version":{"state":"value_present","value":{"kind":"identifiers","identifiers":["c6823355692f3704078d3ed29cd1e71a98b2f8b8d7e3c8ee18ed6d78d7bf1a05"],"role":"SHA-256 of the complete public record and its assessments"},"provenance":{"kind":"curatorial","basis":"SHA-256 of the public record, its assessments, and its displayed answers and notes, excluding its own identifier and the derived coverage summary.","record_fields":[],"source_refs":[]},"review_state":"record_mapped","coverage":"complete"},"workflow":{"state":"value_present","value":{"kind":"record_fields","fields":{"account":"Oak National Academy built Aila, a lesson assistant for teachers in England, on OpenAI's GPT-4o large language model. The Education Endowment Foundation funded a trial, and the National Foundation for Educational Research (NFER) evaluated it independently. In autumn term 2025, 464 teachers of Years 3 to 6 in 108 schools were randomly assigned, school by school, to an Aila group or a comparison group. Both groups could use other generative AI tools. Teachers recorded their planning time in a weekly diary for ten weeks. Teachers in the comparison group spent 3.3 hours a week preparing lessons and resources, and teachers with Aila spent about 2.5 hours. That is a saving of 0.8 hours, or 48.6 minutes, a week. Six independent teacher-reviewers judged that the quality of Aila lesson resources was no worse. Aila was used for only 7% of lessons in an average week, and use declined over the trial. Diary data were missing for 10.3% of teachers. NFER published the report in October 2026, and the report gives the finding a high security rating.","replication":{"produced_by":["Teachers received guidance on their assigned condition, including dos and don'ts.","Aila drew first on Oak National Academy's own lesson content through retrieval-augmented generation."],"must_hold":["Teachers check and adapt Aila's outputs before using them in class.","Teachers have lessons to plan for which they lack existing resources."],"echoes":[]}}},"provenance":{"kind":"legacy_record","basis":"Editorial assignment.","record_fields":["account","replication"],"source_refs":[]},"review_state":"record_mapped","coverage":"partial"}},"summary":{"total":91,"addressed":91,"known":31,"reviewed":2,"reviewed_complete":2,"reviewed_partial":0,"record_mapped":29,"review_not_assessed":60,"not_assessed":0,"complete":false,"by_state":{"value_present":31,"not_reported":0,"unresolved":60,"not_assessed":0,"not_applicable":0,"withheld":0,"source_unavailable":0}}},"presentation_version":"81f175bb5bd04bb09e3d134239892f9b42a6ce26a38a54034142e80dc7f646e5"}