Scaffolding1

Sequentially Revealed (Scaffolded) Problems

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This PG code shows how to create multi-part questions that hide from students parts that have not yet been answered correct.

• File location in OPL: FortLewis/Authoring/Templates/Misc/Scaffolding1.pg

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PG problem file	Explanation
Problem tagging data	Problem tagging:
DOCUMENT(); loadMacros( "PGstandard.pl", "MathObjects.pl", "compoundProblem5.pl", "PGcourse.pl", ); TEXT(beginproblem()); $showPartialCorrectAnswers = 1; $scaffold = Scaffold(); INITIALIZE_SCAFFOLD('$scaffold'); $isInstructor = 0; # = 0 when students use it TEXT(MODES( HTML=>'Clicking on a section opens it provided that you have answered previous sections correctly.', TeX=>''));	Initialization: Use the compoundProblem5.pl macro to provide scaffolding (this macro may be renamed to Scaffolding.pl or sequentiallyRevealed.pl in the future). We initialize the scaffolding with the name $scaffold. Set $isInstructor = 0; when the problem is available to students, or set to 1 when debugging. Alternatively, we could set $isInstructor = ($envir{effectivePermissionLevel} >= $envir{ALWAYS_SHOW_SOLUTION_PERMISSION_LEVEL}); to ensure that only users that always have permission to show correct answers can open all of the sections of the scaffolding without needing to enter correct answers.
Context("Numeric"); $answer1a = Compute(11); $answer1b = Compute(12); Context()->texStrings; DISPLAY_SECTION({ section=>1, name=>"1: Antiquated ideas (a descriptive title)", canshow =>1, iscorrect=>$scaffold->requireCorrect(1,2), } , <<'END_SECTION'); Continue the pattern: 7, 8, 9, 10, \{SECTION_ANS($answer1a->cmp), $answer1a->ans_rule(3) \}, \{SECTION_ANS($answer1b->cmp), $answer1b->ans_rule(3)\}. END_SECTION SECTION_SOLUTION({section=>1},<<'END_SOLUTION'); $PAR Put some text here for the solution to section 1. END_SOLUTION Context()->normalStrings;	Section 1: Use DISPLAY_SECTION to set the parameters for the first section. Use section=>1 to set the section number. Use name=>"1: Descriptive title" to give a title for the section. Since the first section should always be available to students, we set canshow=>1. Use iscorrect=>$scaffold->requireCorrect(1,2) to specify that this section will be marked all correct when the answers in answer boxes 1 and 2 are both correct. The text that gets displayed to students starts at "Continue..." Use SECTION_ANS() to record the correct weighted score into the grade book (i.e., database of scores). Note that we use SECTION_ANS($answer->cmp) before $answer->ans_rule(width), which is a bit different from how things are usually done. It is also possible to provide a solution for each section.
Context('Matrix'); $M = Matrix([[1,2],[3,4]]); $v = Matrix([[5],[6]]); $answer2 = $M * $v; Context()->texStrings; DISPLAY_SECTION( { section=>2, name=>"2: Bungling", canshow =>$scaffold->requireCorrect(1,2). " or $isInstructor", iscorrect=>$scaffold->requireCorrect(3), }, <<'END_SECTION'); \( $M $v = \) \{SECTION_ANS($answer2->cmp()), $answer2->ans_array()\} END_SECTION SECTION_SOLUTION({section=>2},<<'END_SOLUTION'); Put solution text here. END_SOLUTION Context()->normalStrings;	Section 2: For kicks, we change to the matrix context. Use canshow =>$scaffold->requireCorrect(1,2). " or $isInstructor" to specify that this section (section 2) can be revealed if answer boxes 1 and 2 are both correct (from section 1) or if the permission level of the user is high enough. Use iscorrect=>$scaffold->requireCorrect(3) to specify that this section (section 2) will be marked correct when the third answer (the entire matrix) is marked correct. We used $answer->ans_array(width) to generate an array of answer boxes with the same size as the correct answer that are treated as a single entity when grading.
$showPartialCorrectAnswers = 1; ANS( $answer->cmp() );	Answer Evaluation:
Context()->texStrings; BEGIN_SOLUTION ${PAR}SOLUTION:${PAR} Solution explanation goes here. END_SOLUTION Context()->normalStrings; COMMENT('MathObject version.'); ENDDOCUMENT();	Solution:

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