Agile - 瀑布、迭代式瀑布、Scrum、Lean的不同

文中描述：Lean和Scrum非常像，Scrum關注特性組（groups of features），Lean關注特性（features）。在Lean開發中，你一個接一個地完成特性（選擇，開發，測試，釋出）。Lean強調減少浪費。
Scrum Development
This approach carries far less risk than Waterfall approaches. We focus on delivering fully-tested, independent, valuable, small features. As such, we diversify our risk – if one feature goes wrong, it should not impact another feature. With that said, we still plan our work in iterations and we will still release at the end of each iteration.

Lean Development
Lean is very similar to Scrum in the sense that we focus on features as opposed to groups of features – however Lean takes this one step further again. In Lean Development, you select, plan develop, test and deploy one feature (in its simplest form) before you select, plan, develop, test and deploy the next feature. By doing this, you further isolate risk to a feature-level. In these environments, you aim to eliminate ‘waste’ wherever possible – you therefore do nothing until you know it’s necessary or relevant.
轉自：The Difference Between Waterfall, Iterative Waterfall, Scrum and Lean Software Development (In Pictures!)