You might think of proposing a solution as a double-layered argument: first, you must argue that a problem worthy of attention or action exists and, second

You might think of proposing a solution as a double-layered argument: first, you must argue that a problem worthy of attention or action exists and, second, that a particular solution will best solve it. The goal is not necessarily to convince readers that only one solution is possible, but that a particular solution to an important problem has merit.