NDLI: On the Ability to Reason About Program Behaviour: A Think-Aloud Study

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On the Ability to Reason About Program Behaviour: A Think-Aloud Study

Content Provider	ACM Digital Library
Author	Izu, Cruz Weerasinghe, Amali Pope, Cheryl
Abstract	Abstraction is a core skill for both programming and problem solving, however it is also a challenge for many students to develop a correct understanding of abstract concepts, such as program behaviour, which causes them to struggle with both introductory and advanced programming courses. Thus, evaluating students' ability to reason about programs should be an important topic for CS education. We use a think-aloud study to record and analyse the strategies students apply to reason about program behaviour within the context of reversibility. Reversibility is a property of a program or function that indicates it could be brought back to its original state. Reasoning about reversibility requires students to have a mental model of the state, thus they should reason about program behaviour as a whole, compared with reasoning about concrete cases using testing and tracing. We have identified four strategies used by students to complete the reversibility task, which we have named as algorithm decomposition, input analysis, abstraction and inductive testing. Although 70% of students successful identified reversibility in 2 of the 3 exercises, most students fail to correctly reason about reversibility in an exercise involving a seemingly simple conditional statement.
Starting Page	305
Ending Page	310
Page Count	6
File Format	PDF
ISBN	9781450347044
DOI	10.1145/3059009.3059036
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2017-06-28
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Reasoning State Programming Reversibility Think-aloud
Content Type	Text
Resource Type	Article

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