Based on the formula of output by Andy S. Grove, apart from increasing the leverage, a commonly used approach to improve manager’s productivity is time management techniques.
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Use the production management principle to identify the ‘limiting steps’ - the things that are immovable. Plan the rest of the activities around them to maximise the output.
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Batching to avoid context switching and to save set up costs, both in physical efforts and in mental energy.
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Use calendar for forecasting.
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Say ‘no’ based on your calendar forecast. This involves active use of calendar - fill the holes between limiting steps with non-critical but necessary activities.
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Plan slack into your work. It will protect your schedule from buckling under even the slightest shock.
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Build a raw material inventory: discretionary projects. Remember to work on them instead of meddling in your subordinate’s work when you have free time.
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Be consistent with your approaches and choose well-established process when possible. Don’t reinvent the wheel.