To document (important) decisions, we like mind-maps or tables.

Mind maps:

• (+) are visually appealing
• (+) can show relationships between different parts of decisions
• (=) are well suited for smaller decisions, where some keywords provide enough information
• (-) require special tools to create or maintain (we count paper and pen as special tool, though)
• (-) are somewhat informal, sometimes not suited in more formal settings

Tables:

• (+) are well suited even for large decisions
• (+) are very easy to create and maintain in many different tools
• (-) lack the visual attractiveness you find in mind-maps.

(+) positive, (-) negative, (=) neutral argument