How to build a simple model by reverse engineering? Using the reverse-engineering approach discussed on pages xvii–xviii, look at the first Introduction below and write a short description of what the writer is doing in each sentence. Note that you are not describing or summarizing what the sentence is saying (the content of the sentence); instead, you are working out what the sentence is doing (the function of the sentence). One way to identify the function of a sentence is to look at the tense of the main verb. What is that verb tense normally used for? Is the verb in the same tense as in the previous sentence? If not, why has the writer changed the tense? Remember that your model is only useful if it can be transferred to other Introductions, so don’t include content words such as polymer or you won’t be able to use the model to generate Introductions for your own research articles. Keep your description simple; Sentence 7 has been done for you as a guide to the level of detail to aim for. Once you have completed the description of the first Introduction, test and adjust your model by applying it to the Introduction in Section 1.3.1, and then to the Introductions in your target articles.