It is very easy for people to think everyone agrees to some somewhat clear statements made in the meeting. Only later it becomes obvious several people have different understandings of what was agreed to...
Writing down decisions greatly reduces the chance of miscommunication. In a meeting clearly writing down decisions (action items etc.) for everyone to see (on a flip chart for example) is a vey useful tactic to improve communication.
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Russell Ackoff also has some great stuff on the importance of documenting decisions – both to serve as guide posts to future action and to serve as documentation that can be examined over time to find historic weaknesses and strengths with decision making in the organization.
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