What is case-based reasoning?

When comparing two sources it is 1) identify diction choices 2) use the same organizational strategy to aid comparison 3) examine both selections carefully 4) compare the voice of the authors asap

Based on this excerpt, charlotte smith and reverend walsh

These two sentences have one difference: one has a comma. think about what each sentence means. 1. let's eat, grandma. 2. let's eat grandma. what does the first sentence mean? what does the second sentence mean?