For the April issue of PHP Architect, we will continue going up the stack as we look at how we can start to design applications. This level is more than likely where projects tend to fail since designing complex systems is, by its nature, complex. In a field that is less than 100 years old, we are still learning how to build software that will not only last longer than us but can also continue to be maintained and updated as needs change. by Chris Tankersley