Calling getNext() multiple times within a single iteration loop when traversing collections.

Call getNext() exactly once per iteration, store the returned object in a temporary variable, and perform all subsequent logical comparisons and operations on that variable.

Accessing attributes or calling methods on array objects without executing a null pointer sentinel check, leading to runtime NullPointerExceptions.

Implement an explicit check 'if (array[i] != null)' to ensure the index actually holds an instantiated object reference before performing any operations on it.

Violating encapsulation by accessing private object properties directly across class boundaries instead of using defined public accessor methods (getters).

Always invoke public getter methods (e.g., s.getArtworkPrice()) when accessing attributes from foreign class scopes.

Failing to update all parallel arrays simultaneously during sorting algorithms, resulting in desynchronized and corrupted relational data.

Construct swap operations using temporary storage variables that swap elements across all associated parallel arrays at the exact same index.

Providing one-sided, feature-list descriptions for 'compare and contrast' or 'evaluate' command words, rather than structured, balanced comparative analyses.

Use explicit comparative syntax ('whereas', 'unlike') and ensure you analyze both similarities/differences or advantages/disadvantages before writing a reasoned conclusion.

IB DP · 試験対策

Computer Science 試験対策

Master IB Diploma Programme Computer Science with this expert examiner guide. Grounded in official assessments, this guide breaks down Paper 1 algorithm tracing, Paper 2 Option D OOP encapsulation, and UML class diagram modelling, providing actionable strategies to avoid common traps and secure maximum marks.

読了時間 5 分更新日: 2026年6月21日

試験の概要

試験数

満点

195

制限時間

4時間 30分

出題形式

試験	時間	配点	問題数	配点比率	出題形式
Paper 1	2時間 10分	100	—	—	—
Paper 2	1時間 20分	65	—	—	—
Paper 3	1時間	30	—	—	—

評価段階

7654321

電卓の規定

A graphic display calculator (GDC) from the IB-approved list is required for most Mathematics and Sciences papers and must be set to examination mode. Note that some papers do not permit a calculator (for example Mathematics Paper 1 and the multiple-choice Sciences Paper 1).

AO1: Know and understand relevant facts, concepts, and terminology (35%)
AO2: Apply and use computer science concepts, theories, and techniques (40%)
AO3: Evaluate, design, and construct computer systems, designs, and algorithms (25%)

過去問と採点基準にもとづいて作成（2023–2025）。

電卓プログラム

Graph: zeros, intersections & turning points

Graphical calculator / GDC (exam mode)

目的: Plot a function to read its roots (zeros), points of intersection, and maxima/minima.

使う場面: Checking solutions, sketching, or solving where an analytic method is hard.

手順

Graph the function(s) and use the built-in zero, intersect and maximum/minimum tools.

試験での注意: Use a GDC from the IB-approved list in examination mode. Some papers do not permit a calculator. Always show your reasoning.

Numerical equation solver

Graphical calculator / GDC (exam mode)

目的: Solve an equation or find a variable numerically when an algebraic route is long or implicit.

使う場面: Iterative or implicit equations, or to confirm an algebraic solution.

手順

Use the equation/zero solver, entering the equation and a sensible starting estimate.

試験での注意: Use a GDC from the IB-approved list in examination mode. Some papers do not permit a calculator. Always show your reasoning.

Numerical integration & differentiation

Graphical calculator / GDC (exam mode)

目的: Evaluate a definite integral \(\int_a^b f(x)\,dx\) or a gradient \(f'(x)\) at a point.

使う場面: Checking calculus answers, or where only a numerical value is needed.

手順

Use the GDC's numeric integral / derivative function with the limits or the point.

試験での注意: Use a GDC from the IB-approved list in examination mode. Some papers do not permit a calculator. Always show your reasoning.

Statistics & probability distributions

Graphical calculator / GDC (exam mode)

目的: 1-var/2-var statistics, linear regression, and cumulative binomial / normal / Poisson probabilities without tables.

使う場面: Statistics questions and hypothesis tests.

手順

Enter data in the statistics editor, or use the distribution menu (binomial cdf, normal cdf, …).

試験での注意: Use a GDC from the IB-approved list in examination mode. Some papers do not permit a calculator. Always show your reasoning.

よくあるミス

1high影響する配点: 2Computational thinking
Calling getNext() multiple times within a single iteration loop when traversing collections.
回避方法: Call getNext() exactly once per iteration, store the returned object in a temporary variable, and perform all subsequent logical comparisons and operations on that variable.
2high影響する配点: 4Object-oriented programming (OOP)
Accessing attributes or calling methods on array objects without executing a null pointer sentinel check, leading to runtime NullPointerExceptions.
回避方法: Implement an explicit check 'if (array[i] != null)' to ensure the index actually holds an instantiated object reference before performing any operations on it.
3high影響する配点: 3Object-oriented programming (OOP)
Violating encapsulation by accessing private object properties directly across class boundaries instead of using defined public accessor methods (getters).
回避方法: Always invoke public getter methods (e.g., s.getArtworkPrice()) when accessing attributes from foreign class scopes.
4medium影響する配点: 3Computational thinking
Failing to update all parallel arrays simultaneously during sorting algorithms, resulting in desynchronized and corrupted relational data.
回避方法: Construct swap operations using temporary storage variables that swap elements across all associated parallel arrays at the exact same index.
5medium影響する配点: 6System fundamentals
Providing one-sided, feature-list descriptions for 'compare and contrast' or 'evaluate' command words, rather than structured, balanced comparative analyses.
回避方法: Use explicit comparative syntax ('whereas', 'unlike') and ensure you analyze both similarities/differences or advantages/disadvantages before writing a reasoned conclusion.

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