Framing a deck around an above ground pool can be a challenging project.  Many above ground pools are round which requires the deck to wrap around its base using a system of short segmented beams supported by a large number of posts and footings.  Laying out the footings can also be quite difficult because there may not be any corners to use as references.  You may need to use the triangulation method of footing layout by establishing two fixed and independent points from which to pull measurements from such as the center of the pool or a tree. 

Always be careful not to puncture or damage the pool during construction.  This type of project usually requires some improvisation during construction to get everything lined up appropriately.  Try to create a clean and smooth edge between the pool and deck.  Also consider how safely they work in combination.  Make sure there will be no slivers or sharp edges or exposed fasteners that might cut bare feet.  Don’t leave any openings between the deck and pool that might create a tripping hazard.  You will usually need to install a gate that can be locked to limit access to the pool and act as a safety feature.