I think you might be missing the point of the article. The metric for measuring a game&#x27;s success is how fun it is to play. You can&#x27;t plan fun, that only comes from having a playground and tweaking things until the game play feels satisfying. Note I use words like <i>fun</i> and <i>satisfying</i> - words that are all highly subjective, and can only really be ticked off when you have the game in front of you and can agree it was fun to play.<p>The metric for measuring the success of software on the other hand is directly proportional to the amount of functionality it implements, as defined in  the requirement spec. These totally different goals for development are the reason the industries are so different, and why one is harder to plan for than the other.