Because the focus is on everything inside the project our thoughts, assumptions and beliefs of what is happening outside the project shapes the plans we make and the actions we take. Methods, ideas, and conversations ensure everything else lines up to support these assumptions. Factual information and the perceptions of others are ignored.
Project owners are on a mission; they live to deliver a project forgetting the business and daily operational needs beyond the project. Sometimes an external project trigger will makes ears prick up so information is heard and acted on.
Successful project owners know tapping into this external source of intelligence early prevents the island from forming in the first place.