Which part of project planning do you find the most challenging?

Colleagues;

As we all know, planning is the foundation of a successful project, but we each have that one specific area where we struggle the most.

In my experience, creating the schedule (cronograma) is always the toughest part. Because our organization follows a strict Waterfall approach, my team and I can only change dates through a formal change request process. This puts a lot of pressure on me to achieve a very high level of precision and accuracy from day one.

I always set a high bar for myself because I see the schedule as a serious commitment to the team and the stakeholders. However, balancing that need for accuracy with the reality of project risks is a constant challenge.

What about you? Which part of the planning phase do you find the most difficult? Is it the budget, the risk register, the resource allocation, or something else?

I look forward to hearing your perspectives and learning from your experiences!