Introduction to Computational Thinking

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Presentation transcript:

Introduction to Computational Thinking Abstraction (C) Dennis Kafura 2016

Abstraction Humans have always used abstraction to model and understand the world With computers we can form abstractions using a new medium – information. Information abstraction is one of the two “big concepts” of computational thinking Information abstractions can be manipulated via algorithms (the second “big concept” of computational thinking) (C) Dennis Kafura 2016

Magritte and abstraction The Treachery of Images “An object never serves the same purpose as its name or its image.” Rene Magritte (C) Dennis Kafura 2016

Familiar abstractions What is this an abstraction of? For whom (aka. stakeholder) is it designed? What are its properties? (C) Dennis Kafura 2016

Alternative view… What is this an abstraction of? Who is the stakeholder? What are its properties? (C) Dennis Kafura 2016

Information Abstraction Maps are physical abstractions of physical things We can also form information abstractions of physical things An information abstraction is A set of properties relevant to a specific stakeholder Each property Is objective and observable Is named Recorded in quantitative terms (numbers, characters, codes, categories) (C) Dennis Kafura 2016

Representing Abstractions name stakeholder description Movie On-Line Customer Title Genre Gone With the Wind Drama properties instances values (C) Dennis Kafura 2016

Movie On-Line Customer Pirates of the Caribbean Example Movie On-Line Customer Title Year Length Genre Format Price Moneyball 2011 133 min. Sports Blueray $15.00 Gone With the Wind 1939 219 min. Drama DVD $10.95 Jurassic Park 1993 127 min. SciFi $12.50 Pirates of the Caribbean 2003 143 min. Comedy $17.50 Sicko 2007 116 min. Documentary Streaming $11.75 (C) Dennis Kafura 2016

Movie On-Line Customer Pirates of the Caribbean Correspondence Each instance corresponds to a single real-world entity. Movie On-Line Customer Title Year Length Genre Format Price Moneyball 2011 133 min. Sports Blueray $15.00 Gone With the Wind 1939 219 min. Drama DVD $10.95 Jurassic Park 1993 127 min. SciFi $12.50 Pirates of the Caribbean 2003 143 min. Comedy $17.50 Sicko 2007 116 min. Documentary Streaming $11.75 (C) Dennis Kafura 2016

Cohort work and Reports Complete the representation of the abstractions distributed at your table. Report back in 20 minutes. Class discussion. (C) Dennis Kafura 2016

Alternative view What is this an abstraction of? Who is the stakeholder? What are its properties? (C) Dennis Kafura 2016

Yet another alternative What is this an abstraction of? Who is the stakeholder? What are its properties? (C) Dennis Kafura 2016