An ability to boost company performance, resolve staff disputes and other leadership skills can trump a stellar resume when it comes to moving up the corporate ladder, employers say.

Based on a survey of 4,600 employees nationwide, Minneapolis-based leadership consulting firm Personnel Decisions International recently identified a range of leadership skills employers typically look for when assessing workers for a promotion.

At the lowest level, these include an ability to improve a company's product or service, manage projects and teams, and standard procedures, the survey found. Mid-level leaders must be able to turn around a struggling organization, negotiate labor agreements, and help employees with performance issues. At the highest level, executive leaders are expected to resolve crises, restructure business investments and launch new divisions.

"Many companies understand the value of providing leaders with stretch assignments in order for them to be ready to move up the leadership ladder," PDI Vice President Stuart Crandell said in a statement.