It’s important to keep in mind that

It’s important to keep in mind that any project can use a combination
of organizational structures. For example, consider an operating guide
on how to use a washing machine. The guide might use a combination of
the chronology and category organizational structures. The overall structure
might be categorical (i.e., Before You Begin, Regular Washing Cycle,
Delicate Cycle, Troubleshooting Guide , and so on). Within each category,
however, the detailed instructions are likely to be organized chronologically
(e.g., the Before You Begin section might start with “Before using your new
washing machine, read the following safety instructions.”).