As evident of the video on avalanches, it can be observed that human factors do contribute to mass movements, not just natural factors only.
An introduction to mass movement: http://www.uwsp.edu/geo/faculty/ritter/geog101/textbook/mass_movement_weathering/mass_movement_1.html
Moreover, this website gives a clear explanation on the different kinds of weathering as well.
Slope stability is an integral part of mass movement: http://www.tulane.edu/~sanelson/geol204/slopestability.htm
This link provides informative slides on mass movement. Slides 6 onwards is particularly useful: http://www.authorstream.com/Presentation/AscotEdu-55942-Mass-Movement-GLG110-Geologic-Disasters-Environment-Disaster-Day-Pollution-Pipeline-Burst-Overview-a-Travel-Places-Nature-ppt-powerpoint/
If you are confused about how to organise your case studies for maass movement, here is an example: http://www.mjanderson.chislehurst.btinternet.co.uk/hazmassmovement.htm
To get a bigger picture of what different mass movements look like..: http://geography.about.com/gi/o.htm?zi=1/XJ&zTi=1&sdn=geography&cdn=education&tm=122&gps=277_1919_1419_722&f=11&su=p284.9.336.ip_&tt=2&bt=1&bts=1&zu=http%3A//pasadena.wr.usgs.gov/office/given/geo1/powerpoint/MassWasting_files/v3_document.htm
