什么是IB Core IA？三大核心任务概览 | What Is IB Core IA? Overview of the Three Core Tasks

什么是IB Core IA？三大核心任务概览

IB文凭课程（Diploma Programme）的核心（Core）包含三个必修模块：Extended Essay（EE，拓展论文）、Theory of Knowledge（TOK，知识论）以及Creativity, Activity, Service（CAS）。其中EE和TOK Essay涉及严格的字数要求，CAS主要通过反思记录和活动日志评估，无硬性字数限制。此外，六大学科组每门课都有自己的Internal Assessment（IA，内部评估），字数或页数要求各不相同。本文系统梳理IB Core IA中EE、TOK Essay以及各学科IA的字数规范，帮助你在写作中精准控制篇幅，避免因字数不合规而被扣分。

EE（Extended Essay）拓展论文字数要求

EE是IB核心中最具重量的学术写作任务，要求学生围绕研究问题进行约4000字的独立论文。IB官方明确规定，EE正文部分（引言到结论，不含参考文献、附录、目录、致谢和图表标题）不得超过4000词。超过部分考官不予评阅。建议将字数控制在3500-4000词——太少论证深度不足，太多触碰红线。合理结构分配：引言200-300词、文献综述300-400词、方法论200-300词、主体分析2000-2500词、结论300-400词。这样既保证论证充分展开，又不超出上限。

TOK Essay知识论论文字数要求

TOK Essay上限1600词，同样只计算正文部分，不包含引用和参考文献。相比EE，TOK Essay篇幅短小但密度极高——需在有限字数内完成从知识主张到反论再到结论的完整辩证。典型结构：引言100-150词、主张展开400-500词、辩证反驳400-500词、综合结论200-300词、个人反思100-150词。关键是以"知识问题（Knowledge Question）"为线索贯穿全文，每个段落都要回答"我们如何知道？"这一核心追问。

TOK Exhibition评论字数要求

TOK Exhibition是2022年改革后的新评估形式，需选择三个物品（Objects），围绕IA Prescribed Title写950词的评论。每个物品约300词，不需像TOK Essay那样展开复杂论证，重点是说明每个物品如何与所选IA Prompt产生关联。评分维度包括物品选择恰当性、关联清晰度及整体连贯性，而非字数越多越好。

各学科IA内部评估字数与页数要求汇总

自然科学类（Biology, Chemistry, Physics）的IA以实验报告形式提交，页数上限12页，不含标题页和参考文献，实际可写约2000-2500词。数学IA（Math AA/AI）要求12-20页的数学探索报告。语言与文学类（Language A）Written Task为800-1000词；语言习得类（Language B）Written Assignment为300-400词。个体与社会类如经济学IA每篇评论750词（共三篇），心理学实验报告1800-2200词，地理田野调查2500词。艺术类如视觉艺术比较研究使用屏数限制（10-15屏）而非词数。需注意：IA字数超标不会被直接拒评，但超过过多的部分可能影响分数。

IB IA字数管理的三个实用建议

第一，写作前先规划结构，用大纲分配每部分预期字数，写作过程中实时跟踪已达字数。第二，善用学术语言的简洁性——IB奖励清晰、准确、精炼的表达，删去冗余修饰、合并重复观点、使用精准术语，通常可缩减10-15%字数。第三，定稿后务必用文字处理软件统计"正文"字数而非"全文"字数，确保只计算引言到结论部分，不含标题、脚注、图注、参考文献和数据表格。

IB Core IA Word Count: EE, TOK, and IA Requirements

Every IB Diploma student must complete Core components — Extended Essay (EE), Theory of Knowledge (TOK), and CAS — alongside six subject groups, each with its own Internal Assessment (IA). Word count compliance is mandatory: exceed the limit and the excess text will not be read by examiners. For the Extended Essay, the formal ceiling is 4,000 words, covering the body from introduction to conclusion. References, appendices, table of contents, acknowledgments, and figure captions are excluded. Aim for 3,500-4,000 words — under 3,500 may signal insufficient depth; over 4,000 is penalised. The TOK Essay has a firm limit of 1,600 words. Within this constraint, you must present a claim, counterclaim, and synthesised conclusion, all framed by the prescribed title. Anchor every paragraph in the Knowledge Question — "How do we know?" — and avoid drifting into generic opinion. The TOK Exhibition requires a 950-word commentary on three objects linked to one IA prompt. Allocate about 300 words per object. Assessment rewards object relevance and clarity of connection, not word count inflation. Subject-specific IA requirements vary. Science IAs (Biology, Chemistry, Physics) are capped at 12 pages, roughly 2,000-2,500 words. Mathematics IAs span 12-20 pages. Language A Written Tasks range from 800-1,000 words; Language B Written Assignments at 300-400 words. Economics commentaries are capped at 750 words each, Psychology reports at 1,800-2,200 words, and Geography fieldwork at 2,500 words. Arts IAs use screen-based limits rather than word counts. Three practical tips: First, outline with target word counts per section before writing and track progress. Second, embrace concision — IB rewards clarity, not verbosity; cutting filler can reduce word count by 10-15% without losing substance. Third, count only main body text when finalising, excluding headings, footnotes, captions, references, and tables.

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