<h1>Use Historical Project-Time Data to Improve Future Quotes</h1><p>Past project-time data becomes useful when it is organized by comparable scope, phase, and outcome. It should inform a quote, not dictate it.</p><h2>Build a small reference set</h2><p>Group completed work by type, complexity, dependencies, and revision pattern. Exclude or annotate unusual projects. Keep the original estimate beside actual time.</p><h2>Turn history into assumptions</h2><ol><li>Identify recurring phases.</li><li>Note where overruns came from.</li><li>Update the next estimate and explain the change.</li><li>Review the result after delivery.</li></ol><p>Historical data is not a guarantee because clients, scope, and constraints change. Its value is a clearer starting point.</p><p>Sixton keeps time records by client and project so your next quote can be based on your own evidence.</p><h2>Source</h2><p><a href="https://www.gov.uk/government/publications/cost-estimating-guidance/cost-estimating-guidance">UK Government Cost Estimating Guidance</a>.</p>