Freshen up your management savvy through a retrospective of the top management stories of 2015 from Harvard Business Review — told in charts & graphs. For instance, what is the top communication issue between bosses and employees? Employees say it’s that managers are not recognizing employee achievements. The second biggest issue: managers not giving clear directions. (See the chart for a ranking of other issues.) And the end of year one is the timeframe when most dissatisfied employees quit their jobs.

Another top story showed you may want to consider becoming more humble in the New Year to win respect from your team. The more managers underrate themselves, the more they’re perceived as leaders.

Also, try picking up the phone instead of dashing off another email. The report says that people may think you’re smarter when they hear your voice.

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