Assessment for IB Computer Science SL

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Grading, assessment, and knowing[1]


The assessment component is broken into two parts: external and internal assessment. The external assessment is 70% of your grade, and the Internal assessment is 30% of your grade. The total time for external assessment is 2 hours and 30 minutes. The total time for internal assessment is 40 hours. The material on this page is used from the IB Computer Science Subject Guide[2].

External assessment (2 hours 30 minutes)

Paper 1

1 hour 30 minutes is allocated for an examination paper consisting of two compulsory sections:

  • Section A (30 minutes approximately) consists of several compulsory short answer questions. The maximum mark for this section is 25.
  • Section B (60 minutes approximately) consists of three compulsory structured questions. The maximum mark for this section is 45.

You can earn a maximum of 70 marks for paper 1. It is weighted for 45% of your final grade.

Paper 2

1 hour is allocated for paper 2 which is an examination paper linked to the option studied (which is web science).

  • The paper consists of between two and five compulsory questions. (45 marks)

You can earn a maximum of 45 marks for paper 2. It is weighted for 25% of your final grade.

Calculators: The use of calculators is not permitted in any computer science examination.

Internal assessment (40 hours)

This component is internally assessed by the teacher and externally moderated by the IB at the end of the course.


30 hours are allocated for the solution.

The development of a computational solution. Students must produce:

  • a cover page that follows the prescribed format
  • a product
  • supporting documentation (word limit 2,000 words). (34 marks)

Group 4 project

10 hours are allocated for group 4 project.

To be assessed using the criterion Personal skills. (6 marks) (total 40 marks)


  2. IB Diploma Programme Computer science guide (first examinations 2014). Cardiff, Wales, United Kingdom: International Baccalaureate Organization. January 2012.