Traders' Roundtable

If your trading plan already provide entry and exit signals, all you need to do is to follow it, do you still need to work on forecast? even through you know market is going to up / down in next week based on your forecast, but you still need to follow your trading plan no matter what happen in any conditions.

so do you need to forecast if you follow your trading plan?

Do anyone have any suggestions?
Thanks in advance for any suggestions