The 20 - percent solution
how to stop playing games with your project schedule
Most recently baselined project plans are inaccurate because they have unrealistic start dates, finish dates, work hours, costs and/or durations. Poor estimating during the planning phase is a big contributor to project failures. However, project managers can build more accuracy and credibility into their project plans by incorporating the 20-percent solution into three areas: Realistic schedules, buffer protection, and managing risks.
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