Lean Principles...

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(See http://xprogramming.com/articles/deliver-working-software-frequently/ and http://leanblitzconsulting.com/14-principles-of-the-toyota-way/)

Are you not getting everything you take on finished? Then take on less.
"Use pull systems to avoid overproduction"

Are there defects in your code? Then test it sooner and better. Try pair programming.
"Level out the workflow. Work like the tortoise, not the hare" and “Use visual controls so no problems are hidden.”

Is your code hard to work with? Then refactor it as you go.
"Build a culture of stopping to fix problems, to get quality right the first time"

Is it hard to integrate? Then integrate smaller pieces more frequently.
"Level out the workflow. Work like the tortoise, not the hare"

After you give it to them, do the customers dislike it? Then talk with them more before you start.
“Create a continuous process flow to bring problems to the surface.”

Are you still not delivering solidly? Then think about how to improve every week or two.
“Become a learning organization through relentless reflection and continuous improvement.”