tl;dr:James offers a simple technique on when to ask for feedback on a project: (1) When you’re 30% done with the project, ask your audience "are we on the right track?" Seek the following answers: if what you are doing makes sense, first impressions on the concept, if it meets relevant customer and business needs, suggestions for other people or teams to involve, etc… (2) When you're 90% done with the project, ask your audience: "is there anything we've missed?" In terms of input, seek: typos and shoddy grammar, jargon, complex, or excluding language, inappropriate tone and emotion, etc...