Design
Even if you feel great about knowing the architecture of your target platform without a good design you are going to be sunk. Try not to fall into the trap though of over-designing the application. The two basic principles are to "Keep it Simple" and to utilize information hiding (Don't show the user more than they need to see). Often this is where object-oriented analysis and UML come in. Do an internet search on UML and you'll find dozens of articles on using it.
Read more about this topic: Best Coding Practices
Famous quotes containing the word design:
“What but design of darkness to appall?—
If design govern in a thing so small.”
—Robert Frost (1874–1963)
“A good scientist is a person with original ideas. A good engineer is a person who makes a design that works with as few original ideas as possible. There are no prima donnas in engineering.”
—Freeman Dyson (b. 1923)
“To nourish children and raise them against odds is in any time, any place, more valuable than to fix bolts in cars or design nuclear weapons.”
—Marilyn French (20th century)