Prefer 'viz' in academic or formal writing to elaborate on a point clearly. The treaty covered several topics, viz: disarmament, trade, and environmental protections.
Pro Tip 2/3
Old-fashioned Tone
'Viz' can feel old-fashioned; ensure it fits the tone of your writing. The grounds contain many amenities, viz: a tennis court, a swimming pool, and a conservatory.
Pro Tip 3/3
Before Lists
Use 'viz' to introduce lists that exactly define or clarify the preceding statement. Our objectives are twofold, viz: to increase sales and to improve customer satisfaction.