Build your reputation as a colleague who is willing to help and does not want anything in return. Others will then be more ready to help you when you need it.
When you decide to ask a colleague for help, don't come with a general statement that something does not work. Formulate your request in advance. First consider what goals you want to achieve and what specific steps it will require.
Your request should be specific (who, what), meaningful (why), action-focused (how), real and time-specific (when).
Do not assume others don't want to help you. Remember that you can never know what others know, whom they know, and how they can help you. Even if you don't specifically mention it, they might involve their contacts in solving your problem.
Create a working environment in which help will be the norm. Show subordinates and colleagues there is no need to worry. Emphasise that asking for help may be more effective than spending time on a problem with which a colleague could easily assist.
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Article source Harvard Business Review - flagship magazine of Harvard Business School