Answer & Explanation

Solved by AI $(1)$

The statement seems to be a mix of project management principles, but it's not a clear question. However, I can provide some context to the numbers mentioned:

$10-12$ full$-$time contributors: This is a common size for a project team. It's large enough to have a diversity of skills and perspectives, but small enough to maintain effective communication and coordination.

$10-20$ months overall duration: The duration of a project can vary greatly depending on its complexity and scope. A $10-20$ month timeframe is common for medium to large projects.

$20$ or more people: This could refer to the total number of people involved in the project, including part$-$time contributors, stakeholders, and others who are not part of the core team.

$300-400$ lowest$-$level activities in the work breakdown structure $($WBS$)$: A WBS is a tool used in project management to break down the project into smaller, manageable tasks. Having $300-400$ tasks is quite large and would typically be seen in a complex project.

Remember, these are general guidelines and the specifics can vary greatly depending on the nature of the project. $1$