The methodology that I am using to compare which bits have been adapted by all is to start with the novel and to break it down into sections, labelling them with their chapter number, and then 1, 2,3 etc so that within each chapter, I have indicated 1.1, 1.2, 1.3 etc. These have been determined based on what Sagan is explaining and what can reasonably be described as a moment, a thought, an event etc. Novels aren't written in scenes like films, or acts and scenes like plays, so to make the sections into what might become scenes, I have further combined the 1.1, 1.2, 1.3 etc together to form a 'scene' that can be described in a sentence.

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For example, in Part 1, Chapter 2, Cécile lies flat out on the beach in the oppressive heat. Cyril comes over to her and they kiss. A car horn beeps, signalling Anne's arrival, which shocks Cécile and she jumps up and runs to the house. 

In the novel, this is described over a couple of pages and I have broken it down into six sections, which all can be combined into one scene; Cécile kisses Cyril on the beach as Anne arrives.

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For the purposes of this section, I will be using this method as described above to refer to such a passage in the novel as 2.1, 2.2, 2.3, 2.4, 2.5, 2.6 Cécile kisses Cyril on the beach as Anne arrives.

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The rationale for detailing the scene into six sections is that the sections are very often the moments that describe the most intellectual or thoughtful moments of Cécile, and are the most often left out. 

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By finding the scenes which are covered by all, I also hope to find out, within these scenes, what has been added, or taken away.