
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
Given the function $f(x)=2\sin (\omega x- \frac {\pi}{3})$, where $(\omega > 0)$, the smallest positive period is $\pi$.  
(1) Find the interval of decrease for the function $f(x)$.  
(2) If $h(x)=f(x)-b$, and $h(x)$ has $2$ zeros when $x\in[0, \frac {\pi}{2}]$, find the range of values for $b$.

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