Analysis of pretest-posttest designs

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Exploring Beliefs About Bottled Water and Intentions to Reduce Consumption The Dual-Effect of Social Norm Activation and Persuasive Information (2015, methodology): “Note that using difference scores as the dependent variable is statistically equivalent to using the post-test measure (Bonate, 2000)—the difference score is used here for more intuitive interpretation of results.”
Manual training of mental rotation in children (2008, unknown): “Therefore, the conclusion that the training effect is due to the training per se seems to be valid, even if using difference scores in pre-and posttest designs might be problematic (compare Bonate, 2000).”
How to communicate the scientific consensus on climate change: plain facts, pie charts or metaphors? (2014, result): “Note that the post-test in this case is statistically equivalent to the difference score (Bonate 2000).”
The effect of Twitter on college student engagement and grades (2011, methodology): “Using difference scores is equivalent to a repeated measures design with two time points (Bonate 2000).”