Story Point is estimated during the Sprint Planning by the team members. It's better if each team member discloses the story point simultanously by using Scrum cards.
For example:
Product Manager creates a story to add a facebook like button in the company website. Developer A quotes 4 hours. Developer B quotes 5 hours. QA quotes 3 hours. In the end, the team decided to use 4 hours(or 5 hours) development + 3 hours QA as the story point.
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故事点是由团队成员在冲刺计划期间估计的。如果每个团队成员使用 Scrum 卡同时公开故事点，那就更好了。
例如：
对于团队 Velocity，请检查这个简单的 说明。
Story Point is estimated during the Sprint Planning by the team members. It's better if each team member discloses the story point simultanously by using Scrum cards.
For example:
For team Velocity, check this simple explanation.