"Whose fault is it?"It's natural to want to blame someone when you've been fired, whether you blame yourself, your boss or a colleague.But it's not productive.It'll be difficult, but try to look at the situation objectively. Take some responsibility for what happened, but don't beat yourself up. Instead, learn from the experience and plan how you can prevent this from happening at your next job.Try not to dwell on anger or bitterness, but channel that energy into your search for a new -- and even better -- job. Sooner or later, an interviewer will ask you why you left your last job. And you should have a response ready.Keep your explanation short. Be calm and objective, and never assign blame. End your explanation on a positive note by emphasizing some of your accomplishments and what the experience taught you.