A-level COMPUTER SCIENCE 7517/2 Paper 2 Mark scheme June 2021 GRADED A+

A-level COMPUTER SCIENCE 7517/2 Paper 2 Mark scheme June 2021 GRADED A+ A-level Computer Science Paper 2 June 2021 To Examiners: • When to award '0' (zero) when inputting marks on CMI+ A mark of 0 should be awarded where a candidate has attempted a question but failed to write anything credit worthy. Insert a hyphen when a candidate has not attempted a question, so that eventually the Principal Examiner will be able to distinguish between the two (not attempted / nothing credit worthy) in any statistics. • This mark scheme contains the correct responses which we believe that candidates are most likely to give. Other valid responses are possible to some questions and should be credited. Examiners should refer responses that are not covered by the mark scheme, but which they deem creditworthy, to a Team Leader. The following annotation is used in the mark scheme: ; - means a single mark // - means alternative response / - means an alternative word or sub-phrase A. - means acceptable creditworthy answer R. - means reject answer as not creditworthy NE. - means not enough I. - means ignore DPT. - in some questions a specific error made by a candidate, if repeated, could result in the loss of more than one mark. The DPT label indicates that this mistake should only result in a candidate losing one mark on the first occasion that the error is made. Provided that the answer remains understandable, subsequent marks should be awarded as if the error was not being repeated. MARK SCHEME – A-LEVEL COMPUTER SCIENCE – 7517/2 – JUNE 2021 5 Examiners are required to assign each of the candidates’ responses to the most appropriate level according to its overall quality, then allocate a single mark within the level. When deciding upon a mark in a level examiners should bear in mind the relative weightings of the assessment objectives. eg In the following questions, the marks available are as follows: Question 02 (max 3 marks) AO1 (knowledge) – 1 mark AO1 (understanding) – 2 marks Question 05.4 (max 7 marks) AO2 (analyse) – 5 marks AO3 (programming) – 2 marks