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Misconception: Students get confused about why every character in NetLogo is called a turtle even if they don’t look like turtles.
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When explaining program structure, highlight which aspects of the program are static and which are dynamic in order to clearly distinguish between the two.
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Misconception: Students believe that in a primitive assignment, x = y could be the equivalent of y = x; they think that the computer science “=” sign is the same as the mathematical “=” sign.
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Misconception: Students think that both the IF and the ELSE cases of a conditional are executed every single time a conditional runs.
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Misconception: Students believe that a method can only be called once on a given object.
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Misconception: Students think that two different variables cannot refer to the same object.
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Misconception: Students believe that reference pointers go both directions such that objects know what points to them.
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Misconception: Students think that it’s possible to write methods that add attributes to a Java class.
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Misconception: Students believe that methods in different classes cannot have the same name.
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Misconception: Students believe that boolean values can only be used in conditionals.
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Misconception: Students create a new object when they only need to copy a reference.
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Misconception: Students create a new instance variable when they only need a local variable.
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Misconception: Students have trouble understanding the difference between the “glide” and “go to” blocks in Scratch.
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Misconception: Students think that when they create a new variable within a function, that function will automatically return that variable’s value when executed.
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Misconception: Students think that “return x*x” changes the value of x to be x*x.
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Misconception: Students believe that when they assign a = b, they are copying b into a rather than making a point to b.
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Misconceptions: Students have difficulty distinguishing between the Broadcast and Say blocks in Scratch.
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Misconception: Student think costumes are outfits rather than the overall appearance of a sprite in Scratch.
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Introduce young students to degrees, decimals, and percentages so that they can use turn and sound blocks in Scratch.