What are the most common issues that affect a successful project budget and schedule performance, and how can the project managers deal with such scenarios?

PM Budgets and Schedules

What are the most common issues that affect a successful project budget and schedule performance, and how can the project managers deal with such scenarios? Be specific in your answer (example, methods, techniques, etc) where possible, support your answer with referenced cases.

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-if possible, include a representative picture

-150 words

-support posts with projects -specific examples, facts, figures and referenced data