
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 the Cartesian coordinate system $xOy$, with the origin $O$ as the pole and the non-negative half-axis of the $x$-axis as the polar axis, a polar coordinate system is established. It is known that the polar equation of curve $C$ is $\rho^{2}= \dfrac {16}{1+3\sin ^{2}\theta }$, and $P$ is a moving point on curve $C$, which intersects the positive half-axes of $x$ and $y$ at points $A$ and $B$ respectively.  
$(1)$ Find the parametric equation of the trajectory of the midpoint $Q$ of segment $OP$;  
$(2)$ If $M$ is a moving point on the trajectory of point $Q$ found in $(1)$, find the maximum value of the area of $\triangle MAB$.

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