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                            (Ed.)
                        
                    
            
                            A choose-your-own-adventure online assessment has been developed to measure the process of modeling undertaken by students when asked to measure the Earth's gravitational constant, g, using a simple pendulum. This activity forms part of the Modeling Assessment for Physics Laboratory Experiments (MAPLE), which is being developed to assess upper-division students' proficiency in modeling. The role of the pendulum activity is to serve as a pre-test assessment with apparatus that students are likely to be familiar. Using an initial sample of student data from a development phase of the assessment, we show that the pendulum activity is able to discriminate between a range of student processes that are relevant to understanding student engagement with modeling as a scientific tool. 
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