
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 $f(x)=x^{3}- \frac {1}{2}x^{2}-2x+c$  
$(1)$ Find the intervals of monotonicity for the function $f(x)$;  
$(2)$ If for $x\in[-1,2]$, the inequality $f(x) < c^{2}$ always holds, find the range of $c$.

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