Reason for Leaving Employment

http://biginterview.com/blog/2013/04/why-did-you-leave-your-last-job.html

The general rule here is that you should always be leaving to move toward a better opportunity. You should never position it as fleeing from a bad opportunity.

Your interviewer wants to feel like her company is wooing you away from your current employer. The ideal answer from their perspective: You are only thinking about leaving because this new opportunity (and the company offering it) is just SO awesome. Maybe you weren’t even looking. Maybe you’re content in your current role, but just could not resist this interview because the position is your dream job.

http://www.job-interview-site.com/reasons-for-leaving-a-job-why-did-you-leave-your-last-job-interview-question.html
Career growth 
You can easily say that you are looking for a change in role and wanted more growth, or even that your position was getting stagnant. This might be an acceptable reason for quitting your job, but this by no means gives you leeway to criticize your job.

Looking for challenges 
One of the most common and simple reasons is that your job was at a standstill and you wished to seek newer avenues and greater challenges.

Restructuring

Relocation

Enhanced Education

Workplace distance

http://work.chron.com/answers-applications-reason-leaving-employment-27337.html

Job Change

If you left your former job to accept a new position, it shouldn't affect your application status. This is especially true if there were no gaps in your employment history. The hiring manager will likely think you were offered a raise, a promotion or a job that was better suited to your skills and interests. On the application you might write, "Accepted position with another company" or "Offered promotion with another agency and accepted it." Don't provide details of what the promotion, raise or job change entailed. The hiring manager can always ask more about it if you're selected for a job interview.

Reevaluate Career Objectives

A former job might not have met your expectations so you left of your own free will, without having another job lined up. Possibly you were unhappy with your job responsibilities, dissatisfied with your workload or had issues with the way the organization was managed. As a result, you might have gaps in your employment history. Write on your application "Decided to reevaluate my career goals and look for other employment opportunities," or "Interested in other possibilities in my career field, better suited to my skills and long-term career goals." It's best to avoid using the word "quit" and don't say anything negative about a former employer or about your former work responsibilities.

http://jobsearch.about.com/od/joblossandresignation/a/reasons-to-leave-a-job.htm

A - F

• Career change
• Career growth
• Changes at company
• Change in career path
• Company cutbacks
• Company downsized
• Company restructured
• Company went out of business
• Dream job offer
• Family circumstances
• Family illness
• Family reasons
• Flexible schedule

G - M

• Getting married
• Going back to school
• Health reasons
• Hours reduced
• Illness
• Job wasn't a good fit
• Job was outsourced
• Good career opportunity
• Good reputation and opportunity at the new company
• Laid off
• Landed a higher paying job
• Leaving the workforce
• Limited growth at company
• Long commute
• Looking for a new challenge

N - Z

• Needed a full-time position
• New challenge
• New job
• Not compatible with company goals
• Not enough hours
• Not enough work or challenge
• Not returning from maternity leave
• Offered a permanent position
• Personal problems
• Personal reasons
• Pregnancy
• Position eliminated
• Position ended
• Relocating
• Reorganization or merger
• Retiring
• Schedule conflict
• Seasonal position
• Seeking a challenge
• Seeking more responsibility
• Staying home to raise a family
• Summer job
• Temporary job
• Travel