
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
In a milk production line, a bag is sampled for inspection every 30 minutes. This sampling method is referred to as $\boxed{①}$. From a group of 30 math enthusiasts in a middle school, 3 students are selected to understand their study load. This sampling method is referred to as $\boxed{②}$. Determine the type of sampling associated with each method.

Present the answer in LaTex format: \boxed{Your answer}
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