
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 $f(x)= \frac {1}{3}x^{3}+ \frac {1-a}{2}x^{2}-ax-a$, where $x\in\mathbb{R}$ and $a > 0$.  
$(1)$ Find the intervals of monotonicity for the function $f(x)$.  
$(2)$ If the function $f(x)$ has exactly two zeros in the interval $(-2,0)$, find the range of values for $a$.

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