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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.

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.

Misconception: Students think that two different variables cannot refer to the same object.

Misconception: Students believe that reference pointers go both directions such that objects know what points to them.

Misconception: Students think that it’s possible to write methods that add attributes to a Java class.

Misconception: Students believe that methods in different classes cannot have the same name.

Misconception: Students believe that boolean values can only be used in conditionals.

Misconception: Students create a new object when they only need to copy a reference.

Misconception: Students create a new instance variable when they only need a local variable.

Misconception: Students have trouble understanding the difference between the “glide” and “go to” blocks in Scratch.

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.

Misconception: Students believe that when they assign a = b, they are copying b into a rather than making a point to b.

Misconceptions: Students have difficulty distinguishing between the Broadcast and Say blocks in Scratch.

Misconception: Student think costumes are outfits rather than the overall appearance of a sprite in Scratch.

Introduce young students to degrees, decimals, and percentages so that they can use turn and sound blocks in Scratch.