Keeping Complex Logic Readable

A formula you write today might confuse you in six months, or break in a colleague's hands. As conditional logic grows, readability becomes as important as correctness.

A formula that works but cannot be understood is fragile. This lesson collects practical techniques to keep long IF, SWITCH, and CHOOSE formulas clear, maintainable, and easy to fix.

The first step to readable logic is choosing the right function:

• Range tests (greater than, between): use IFS or nested IF, ordered consistently.
• Exact value matching: use SWITCH.
• Position-based selection: use CHOOSE.
• Many categories: consider a lookup table instead of any formula.

The wrong tool makes even a short formula hard to follow.