There are many films available which uniquely describe the problems associated with doing missions, especially short-term missions, without thinking it through. Every one is worth watching.
Poverty Inc. (Poverty Inc. is available on Netflix streaming or for rent/purchase at Amazon.)
Short-Term Mission Trips: Helpful to Whom featuring David Livermore
Helping Without Hurting – Part 1: Reconsidering the Meaning Of Poverty – LifeChurch.tv
Helping Without Hurting – Part 2: Seeing God at Work – LifeChurch.tv
Helping Without Hurting – Part 3: Understanding Why Good Intentions Are Not Enough – LifeChurch.tv
Helping Without Hurting – Part 6: Moving Forward – LifeChurch.tv