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The 2008 MacBook Air weighed 3 lb and was at most 0.76 inch thick. These are contemporaneous manufacturer specifications supporting the qualitative trend before 2009.","first_full_achievement_year":null,"full_achievement_documented_by_year":2008,"drift_years":null,"drift_range_years":null,"still_unfulfilled_as_of_review":false,"eligible_for_deadline_metrics":true,"withheld_reason":null},"change_reason":"Complete deadline/current outcome assessment under explicit scope; separate uncertainty from verdict."}],"is_new_in_v03":false,"counting_policy":{"unit":"distinct_forecast_version","identical_repetitions_count_once":true,"alternative_interpretations_count_once":true,"legacy_conditional_rows_count":false},"id":"K002","slug":"k002-lighter-and-thinner-portable-computers","title":"Lighter and thinner portable computers","prediction_paraphrase":"Portable computers become markedly lighter and thinner.","wording_kind":"EDITORIAL_PARAPHRASE","original_quote":null,"primary_category":"Computing hardware","tags":["notebooks","weight","thickness"],"subcategory":"Miniaturization","claim_type":"CAPABILITY","family_id":"K002","parent_statement_id":null,"legacy_ids":["AUD-004"],"origin":"LEGACY_RECONCILIATION","publication":{"forecast_year":1999,"year_basis":"AUTHOR_ARCHIVE_REPRINT","original_book_edition_checked":false,"forecast_year_status":"SUPPORTED_BY_LISTED_SOURCE"},"target":{"text":"2009","deadline_year":2009,"precision":"YEAR","year_start":2009,"year_end":2009,"interpretation":null},"source_verification":{"state":"TEXT_CONFIRMED_IN_LISTED_SOURCE","confidence":"MEDIUM","book_text_not_independently_collated":true},"success_criteria":"Portable computers are substantially lighter and thinner than typical 1999 notebooks; not every computer must shrink.","assessment":{"at_deadline_rationale":"The 2008 MacBook Air was three pounds and at most 0.76 inches thick; earlier PowerBooks provide a concrete size/weight comparator.","at_review_rationale":"Commercial thin laptops substantiate the direction and magnitude. A single earliest breakthrough year is unnecessary.","verdict_qualifier":null,"outcome_evidence_basis":"DIRECT_AND_CONTEXTUAL_EVIDENCE_WITH_EXPLICIT_EDITORIAL_INTERPRETATION","attribution_is_separate":true,"first_event_date_required_for_verdict":false,"at_review_semantics":"FULL_REALIZATION_HAS_OCCURRED_BY_REVIEW_NOT_NECESSARILY_CURRENT_PRODUCT_SALES","review_state":"EDITORIAL_ASSESSMENT_COMPLETE","verdict":"CORRECT","as_of":"2026-10-15","at_deadline":"FULFILLED","at_review":"FULFILLED","confidence":"HIGH","disputed_interpretation":false,"benchmark_ready":true,"rationale":"The 2008 MacBook Air was three pounds and at most 0.76 inches thick; earlier PowerBooks provide a concrete size/weight comparator. Commercial thin laptops substantiate the direction and magnitude. A single earliest breakthrough year is unnecessary.","first_full_achievement_year":null,"full_achievement_documented_by_year":2008,"drift_years":null,"drift_range_years":null,"still_unfulfilled_as_of_review":false,"eligible_for_deadline_metrics":true,"withheld_reason":null},"prediction_sources":[{"source_id":"P01","locator":"The Computer Itself, prediction 2, printed p. 12","role":"FORECAST_ATTRIBUTION"}],"evidence":[{"source_id":"O02","locator":"","role":"OUTCOME_EVIDENCE"},{"source_id":"O03","locator":"","role":"OUTCOME_EVIDENCE"},{"source_id":"O04","locator":"","role":"OUTCOME_EVIDENCE"}],"limitations":"Assessment is conditional on the stated criterion and population. Documented examples establish availability, not universal adoption. The original book edition has not been independently collated.","open_questions":["Original-edition collation remains an attribution task; it does not erase the stated outcome assessment.","An earlier documented instance could refine timing; the documented-by date is not claimed to be the invention year."],"legacy_relations":[{"legacy_id":"AUD-004","relation":"CANONICALIZE"}]}