## Chapter 14 — F2 is the product two times one ### Lesson map Lesson 14. Map, example, EX060. ```mermaid flowchart TD L["likelihood 2"] --> P["product 2"] I["impact 1"] --> P P --> B["low"] B --> R["last line"] ``` The banner title does not store a score. The last two numbers do. ### Logical drawing ```text F2 likelihood 2 impact 1 product 2 band low printed last ``` ### Learning outcomes After this chapter, you should be able to: 1. Multiply F2's two ratings. 2. Say why that product is `low`. 3. Refuse a reading that treats the banner words as the score. ### 14.1 Index 2 is 2. Index 3 is 1. The product is the whole score. F2's tuple is `("F2", "Old web server banner shows version", 2, 1)`. Likelihood 2 times impact 1 is 2. Two fails both `>= 6` and `>= 4`, so the word is `low`. The key `(-2, "F2")` is the greatest of the four first-components once the minus is applied, meaning it sorts last. The title is evidence language for the page. It is not an integer, and the lambda does not parse it. A version banner can still matter to an owner. This script does not measure that. It multiplies the two ratings Maya stored. Changing the title without changing `2, 1` would leave the line's score and band alone. | Field | F2's value | Used in the product? | |---|---|---| | Id | F2 | Only as the tie key | | Title | Old web server banner shows version | No | | Likelihood | 2 | Yes | | Impact | 1 | Yes | ### 14.2 Worked example | Offered claim | Arithmetic | Decision | |---|---|---| | "Score 2, band low, last line." | `2 * 1`, then the thresholds, then the key | Keep | | "The word banner lowers the score by itself." | The integers are the product | Refuse | | "F2 is medium because 2 is a small high." | 2 fails `>= 4` | Refuse | > **Synthetic case.** F2 is one tuple. Its harm is not re-scored in the script. ### Errors and limits Do not edit F2's title and expect the product to move. ### Apply - **EX060 — Product two.** How does F2 arrive at score 2 and the word `low`? *Rubric:* 3 = likelihood 2 times impact 1 is 2; 2 fails both thresholds, so the word is `low`; the title is not the arithmetic;; 2 = the product is 2 and the band is low;; 1 = one number;; 0 = none. ### Continue studying — lesson 14 (chapter 14 of 20) [← Chapter 13](#ch-13) · [Course chapter index](../SUBJECTS.md) · [Chapter 15 →](#ch-15) Continue to the next authored lesson. ## Worked answers **EX060.** Likelihood 2 times impact 1 is 2. That product fails both thresholds, so the word is `low`. The title is not the arithmetic.