levee, you'll probably have a better response if you post your question in the Slope stability engineering forum (forum260), and include a bit more detail about the problem.
Cheers.
Nate Hekman
GEO-SLOPE International Ltd.
There was a long discussion about the pros and cons of LE vs FE slope stability on this forum a few years ago. Dr. John Krahn (CEO of GEO-SLOPE) posted his own response in one of GEO-SLOPE's monthly newsletters.
Nate Hekman
GEO-SLOPE International Ltd.