You can use a formal or informal version control system.

可以使用正式的或非正式的版本控制系统。

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By Saturday night, informal brigades of mostly young men armed with bats, kitchen knives and other makeshift weapons had taken control, setting up checkpoints around the city.

到周六晚上，一个由网球拍，菜刀和其他自制武器武装起来的由年轻人组成的非正式组织已经控制局势，在城市的四周设置检查点。

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Requests are recorded either in change control systems, or even for more informal projects, particularly within eXtreme Programming projects, on CARDS or flip charts.

请求要么记录在变更控制系统中，要么对于更不正式的项目来说，特别是在极限程序设计项目中，记录在卡片上或活动挂图上。

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The solutions are therefore to be found in formal (and informal) rules and regulations to control or eliminate perverse incentives in the market place, and in the governance structures of financial corporations.

ECONOMIST: Economic reasoning

On Sunday, Mahmoud Jibril outlined plans to put the various informal military units that have fought against Col Gaddafi under the control of the Transitional National Council.

BBC: Libya's interim PM feels the heat

The money comes partly through formal credit from state banks that gets washed through other state-owned enterprises but also from informal channels that seem to be out of Beijing's control.

FORBES: Magazine Article