Monday was the 40th anniversary of the Apollo 11 lunar landing. The story of the Apollo program is an historic and inspirational one, but it’s also relevant to software development.

To understand the significance of the Apollo program from an engineering standpoint, we must begin at the beginning…
Gus Grissom, Ed White and Roger B. Chaffee were killed on the launch pad when the Apollo 1 capsule burst into flames just prior to the launch test. What happened? Well, according to Wikipedia (I know, far from an unimpeachable source, but bear with me here):

“Although the ignition source of the fire was never conclusively identified, the astronauts’ deaths were attributed to a wide range of lethal design hazards in the early Apollo command module. Among these were the use of a high-pressure 100 percent-oxygen atmosphere for the test, wiring and plumbing flaws, flammable materials in the cockpit (such as Velcro), an inward-opening hatch that would not open in this kind of an emergency and the flight suits worn by the astronauts.”

In short, no one knows for sure what specifically caused the fire, but everyone agrees that some fundamental errors led to the conditions (whatever they ultimately were).

what really went wrong was at the planning and design stage. NASA was in such a rush to make up lost time in the space race with the USSR, that they got cocky after early successes, cut corners and went full bore toward a fully manned, Apollo capsule before they were really ready.

The precursor missions to Apollo were the Mercury and Gemini projects. These projects had highly specific mission statements and each was directed toward a discrete piece of the overall lunar landing mission. Project Mercury was directed toward getting a man into space, and back again. The goal of project Gemini was to perform extra-vehicular activity (pre-cursor to space walk), and docking maneuvers.

NASA began the mission to the moon with an iterative approach, but switch to a more waterfall like approach where they tried to construct a whole new capsule module from scratch, with the intent of landing on the moon and returning. They used the knowledge gained from the earlier Mercury and Gemini projects, but constructed new - and untested - equipment for Apollo.

The parallel to software development is using an iterative approach to develop phase I of a project, only to throw it away and start over on phase II. The whole purpose of the iterative approach is to focus on small, achievable parts of a greater whole to maintain momentum but also to limit what must be tested and hence limit (theoretically) the universe of possible bugs.

I think the 2 most important software development lessons we can learn from the Mercury, Gemini and Apollo missions are:

1. To be successful, have clear and concise mission objectives (goals).
2. Start small, and build on each success.

This is what made the Gemini and Mercury missions so successful, and ultimately made Apollo 11 possible and it will drastically improve the odds of your next software project being a success as well.

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