Ever wondered whether a single word could change a clause from a recommendation to a legally binding requirement? In this lesson you’ll learn to choose and apply shall, should, and will with precision so your high‑stakes proposals are clear, defensible, and executive‑ready. You’ll get a concise explanation of each verb’s force, audience‑aware tone guidance (US Federal & UK MOD), measurable readability targets, practical revision steps, real‑world examples, and exercises to test your decisions. By the end, you’ll confidently draft compliance language that preserves legal effect while meeting plain‑language and procurement standards.