Is brainstorming only for the beginning of the writing process or can it be done at any time?

When you have to argue for or against a topic, which brainstorm technique is the most helpful?

Which of the following is NOT a rule of brainstorming?

What is the goal of brainstorming?

You have to write about an object that has sentimental value. You know what object you want to write about, so which brainstorming technique will be most helpful?

You have to explain what improvement you would like to make to your neighborhood. You know you would like to add a dog park, but you are having trouble thinking of specific details about the park. Which brainstorming technique would be most helpful to you?