During project planning, cost estimation and time estimation for completing a project is the most challenging task for the project manager. There are many of factors that can affect the project manager in making these decisions. Sometimes, it’s the end client who requests a change at the last minute and the supplier must incorporate to make the client or the customer happy. At other times, it’s the project manager lack of abilities to communicate well with the team and the SME (Subject Matter Expert) before finalizing the deadlines. During my experiences, one of the project was set back because the material used for manufacturing wasn’t tested and no record for tensile strength. As a result, this caused the project deadline to push back. From this experience, the project manager learned that interaction with the team twice during a week and taking an advice from SME is a great way to complete a project efficiently and accurately.