Removing ideas that don't support the mission statement

Now it's time to clean up the list. Remember that an app should be goal-oriented. So, look at your mission statement and remove all items from your list that do not support this goal.

My list looks like this now:

• Note incoming plane type
• Note incoming airline
• Note outgoing plane type
• Note outgoing airline
• Note weather conditions
• Take pictures of the planes
• Warn friends about exciting plane arriving or going
• Check weather before spotting
• Order pizza when spotting planes
• Looking up date of first appearance of a plane type
• Note the runway planes use
• Share pictures with friends

The weather conditions are not relevant when you want to keep track of what planes arrive or depart. They are very relevant to the pilots; they need to keep track of the wind and the direction they need to take, but for us this is less interesting. After all, certain wind directions cause the planes to depart from another runway. We have got that covered in the Note the runway planes use part.

The pizza function sounds great, I can imagine that you might get hungry when you are in a field all day long, but I am sure there are other apps that do that already. The same applies to the weather checking beforehand.

Warning friends and sharing pictures of planes with friends seem reasonable, but we can do this using the existing social networking apps, such as Facebook and Twitter. They are probably already available on your device, so why replicate this? We can, however, add an option to launch these apps from our app.