Which of the following is the BEST candidate for a three-point estimate?

You are the project manager for a sewage treatment plant. The government has mandated that you have to ensure that the sewage plant will not adversely impact the neighborhood. From a project perspective, this is a (an):

There are some costs like legal costs or insurance costs are categorised as:

A company is involved in a mining project. There are some external stakeholders with no knowledge of the mining industry.
How should the project manager communicate the organizational culture and project goal to these stakeholders?

You have just been given a new project and are creating the project plan. You are reviewing team member planning assumptions, information from similar projects and the identified constraints and assumptions. What tools will you utilize in order to complete the project plan?