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La ejecución de proyectos siempre ha sido una tarea difícil, se trata de mantener bajo control muchas variables, y tener planes de contingencia ante cambios de las variables que can not be controlled.

have developed many methodologies that have evolved over time, there is even an entity that coordinates and brings together research and development in this area is the PMI (Project Management Institute - Project Management Institute).

Projects that have technological or involving an important component of technology are particularly complicated because, even when using technology has been developed to measure the level of complexity is very high in addition to the improvements in labor efficiency, implement new technology involves changing processes or procedures. Beyond

to have an organized system for the project (which is what methodologies offer), there are a number of external variables that should be taken into account. These variables are:

• culture. In this new globalized world, seek economies of scale to reduce costs by unifying all processes and products of course. Taking on the success of a product / project in a certain place or country, no guarantee that you will have the same success elsewhere because culture varies.
• communication. The same economies of scale and standardization for cost reduction makes it very common participants implement projects with geographically dispersed (even people in different continents) as is necessary to ensure that the language used is the same for everyone.
• market maturity. This detail is something that sometimes passes, driven by the thrill of representing a novel idea.
• details. There are so many variables, so many details it is impossible to control all therefore have to pay attention to information sent by customers, it can be more illogical.
• model. The strategy that works in half, or always has worked, not necessarily work the next time. You have to validate everything as if for the first time.
• Knowledge market. Believe that it knows what the market needs, or think that a survey (or market research) is a standard (and not a guide that is what it is) is one of the most common mistakes. This happens especially when working in completely new and innovative products (the photocopy at the time, for example, notes "Post-it" too, etc).
• Product knowledge. No one will have a better knowledge than he who conceived and those who subsequently developed / built, at least in its early days, but to think that everyone will have as much knowledge as such simply because they have all received training is also very common error.

Here are some famous projects that have been affected by not taking into account variables such as those mentioned above:

• The Mars Climate Observer, a spacecraft 125 million dollars that would study Mars' climate, was incinerated in the planet's atmosphere by a flaw in the calculation of the entry path. The investigation determined that a contractor used metric English (feet) while the rest used the metric system (meters) leading to errors in calculations (1).
• Newton was a PDA (Personal Digital Assistant - Personal Digital Assistant) developed by Apple in late 80's and late of 90. With a lot of advances for the time (some have been included in recent versions of Mac OS X - Operating System Apple computers), the Newton never really took off and was taken off the market. Today's PDAs are everywhere (2).
• "Whenever I go to buy a vanilla ice cream and I prepare to return to my house the car will not start. On the other hand if I buy an ice cream of any flavor the car works perfectly.'ll Think I'm crazy, but I matter what you may seem stupid my claim "This was in essence the content of a letter of complaint that generated so much grace from the Pontiac division staff in the United States finally a copy reached the hands of company president, who has deployed an engineer to deal the case. After careful analysis of the case was detected when the owner of the Pontiac was going to buy vanilla ice cream shorter time to return the car, when acquiring any other flavor. For this reason the engine cooling was not reached and no fuel vapors dissipated preventing a restart was instantaneous. Thanks to this claim of the owner of a Pontiac model 99, this division of General Motors changed the fuel system and introduced an alteration in all models from that year (3).
• The explosion Ariane 5 (1996). The rocket-to 8 billion dollars, which contained 4 satellites worth $ 500 million, exploded after suffering a bug in your computer, the unit jumped into pieces to 36.7 seconds after launch, when trying to convert some data 64-bit format to 16-bit format (4).

References:
(1) http://www.voolive.blogspot.com/2007/11/errores-tecnolgicos-y-desastres-de.html
(2) http://en.wikipedia.org / wiki / Newton_ (platform)
(3) http://www.camionesybuses.com/actualidad/2002/03-mar-2002.htm
(4) http://www.voolive.blogspot.com/2007/
11/errores-tecnolgicos-y-desastres-de.html