How to handle dependent tasks in GTD. For example: Task 1 (Check if product 1 or product 2 is the right one) Task 2A (Buy product 1) Task 2B (Buy product 2) Other example Task 1. RND buy a X car. Task 2. Go to car dealer and buy X car I know that task 2 (in the car example) depends on Task 1. How to handle it? When I start actioning my tasks task 2 pops up. What the best practices in GTD.