Win/loss analysis seeks to understand why sales were won or lost by examining data from sales, finance, customers, prospects, and competitors. The goals are to discover insights to improve future sales and determine the most important factors like pricing, resources, decision makers, and sales process. Data is analyzed using tools like CRM and Excel to measure dimensions like dollars, counts, sources, and timing. Insights are then presented and used to refine strategies, abandon low potential opportunities, and continually monitor and improve results.