Errata

Note that since the code snippet on page 12 is an example of a bad practice, it also includes a SQL injection flaw. This is not elaborated upon because the focus of the exercise is to assess the code's maintainability.

For clarity and consistency with the threshold tables, the highest categories in the donut chart legends should read:
-Figure 2-2 (Java p.26/C# p.27) should be "61 or more" instead of "61+". The orange category in the second/third charts of this figure should read "31-60" instead of "30-60".
-Figure 3-2 (Java p.40/C# p.42 ) should be "26 or more" instead of "25+"
-Figure 5-1 (Java p.64/C# p.66) should be "7 or more" instead of "7+"
-Figure 6-1 (Java p.76/C# p.80) should be "51 or more" instead of "51+"

Note that on p.40 (§3.2) we purposely leave the +else+ line in the code snippet to improve code analyzability (that is, removing the +else+ line would not change the code's behavior).

The effect of this added line should be marginal to the actual code maintainability. Also, for the sake of consistency we apply the same coding style as in the code snippet before refactoring.