Final answer:
According to Brooks, lack of critical thought is the primary non-technical cause of project failure. Additionally, insufficient evidence, too many generalities, and lack of clarity can also contribute to project failure.
Step-by-step explanation:
According to Brooks, the primary non-technical cause of project failure is the lack of critical thought. This refers to unconscious assumptions about how the future will unfold based on recent, anomalous history. When project managers fail to critically analyze the project's goals and potential challenges, it can lead to poor decision-making and ultimately project failure.
Another important factor that contributes to project failure is the inability to conduct long-term follow-up evaluations. Without proper systems in place to assess the project's progress and make necessary adjustments, it becomes difficult to identify and address issues before they escalate.
Additionally, **insufficient evidence** to support main ideas effectively and **too many generalities** rather than specific facts can also contribute to project failure. Lack of clarity, missing substance, and unfocused advocacy in project claims are other factors that can hinder its success.