We all use support to make decisions and we can all learn to support decisions. Supporting a decision will look different for every person, it might mean helping someone to get information or weigh their options.
Support is unique for each person and each decision. Writing down what support looks like for the decision maker is one way of telling other people what the person needs to help them make a decision.
Sometimes we have trouble making our decisions happen or having our decisions respected. Documenting a decision and how that decision was made may help the person have their decision respected.