"A method of depicting, scheduling, and prioritizing a complex set of activities in a way that supports effective project management. This method provides excellent visibility into a project's progress and potential obstacles and risks." (Steven Haines, "The Product Manager's Desk Reference", 2008)
"A technique for estimating that applies as weighted average of optimistic, pessimistic, and most likely estimates when there is uncertainty with the individual activity estimates." (Project Management Institute, "Practice Standard for Project Estimating", 2010)
"A model for project or process management to evaluate tasks involved in the project or process in order to find the shortest duration possible." (DAMA International, "The DAMA Dictionary of Data Management", 2011)
"Evaluates the probable duration of a project by calculating a weighted average of the best-case estimate, most likely case estimate, and worst-case estimate." (Bonnie Biafore, "Successful Project Management: Applying Best Practices and Real-World Techniques with Microsoft® Project", 2011)
"A statistical approach to estimating that uses a weighted average of three values: optimistic, pessimistic, and most likely." (Bonnie Biafore & Teresa Stover, "Your Project Management Coach: Best Practices for Managing Projects in the Real World", 2012)
"An estimating technique that starts with a network chart and combines optimistic, best estimate and pessimistic estimates to produce an overall estimate of the most likely duration and standard deviation (spread of likely durations) for a project activity." (Mike Clayton, "Brilliant Project Leader", 2012)
"An event-oriented network analysis technique used to estimate project duration when there is a high degree of uncertainty with individual activity duration estimates. PERT applies the critical path method to a weighted average duration estimate. It is considered a probabilistic method." (Peter Oakander et al, "CPM Scheduling for Construction: Best Practices and Guidelines", 2014)
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