書評 and 要約: a review’s purpose and a summary portion
Read review and summary examples, then distinguish the purpose of a whole review from a condensed-content portion in an author-written scenario.
A book review introduces and evaluates a book
「読んだ小説について、千字ほどの書評を書いた。」 describes writing a review of about a thousand characters on a novel that was read. That length belongs to this example; it is not a defining requirement for 書評.
「新聞の書評を読んで、その歴史書に興味を持った。」 describes becoming interested in a history book after reading a newspaper review. Reviews are not restricted to newspapers, and this sentence does not supply the actual review body.
A summary condenses key content
「報告書の要約を最初のページにまとめました。」 places a report’s summary on its first page. That is the summary’s location in this example, rather than a required location for every summary.
「長い説明を三行に要約してノートに書きました。」 describes condensing a long explanation into three lines in a notebook. Read the function of condensation without treating three lines as a universal format.
Whole and part in an author-written scenario
Author-written scenario: a book review first condenses a novel’s plot, then evaluates a character’s actions and adds opinions about the work. This scenario was created to compare whole and part; it does not quote the review mentioned in the word examples.
In this author-written scenario, the plot-condensing portion performs the function of 要約. The whole text, including evaluation, serves the purpose of 書評. A summary within it does not turn the entire review into a text devoted only to summarizing.
In the author-written scenario, what function does the plot-condensing opening have, and what purpose does the whole text with evaluation and opinions have?
Show the answer and why
The opening performs the condensing function of 要約, while the whole text introduces and evaluates the book as a 書評. This whole-and-part comparison belongs to the author-written scenario; the supplied word examples contain no actual review body or summary portion.

