Look at the joint
A first success check should fit the goal you chose. If the goal concerns a draft near a door, check that location and check the door. A finished bead of sealant is evidence of an action, not evidence that comfort improved. Record the starting observation under ordinary conditions and repeat a similar observation later.
Include an operating requirement, such as an easy latch and a clear exit. A weather difference may limit the comparison. Write that limitation instead of forcing a success claim. This first check is qualitative. Whole-house air-leakage measurements require a more systematic assessment than a hand held near a door.
Supplied case
Before any repair, Rowan notes a draft along the latch side on a windy evening. The door currently opens and latches easily.
Write one comfort check and one operating check for the eventual repair.
Attempt first, then compare the worked response
Recheck the latch-side draft under comparable windy conditions. Confirm that the door opens, closes and latches without extra force.
The two checks test the intended benefit and a function the repair must preserve. They avoid confusing appearance with performance.
Check your response: Both the comfort observation and normal operation must be addressed before calling the first task successful.
Related background; case choices, quantities, prices and dates are hypothetical course exercises: Natural Resources Canada, Keeping the Heat In.
Your first draft record names a location and an uncertainty. The next lesson explains which parts of the house could carry that unwanted airflow.