The improvement aspects shpuld be industry specific and hence general suggestion may not work.
In general, you should first identify and analyse the weak areas. Remember, productivity is elimination of losses. So focus on losses and start looking for the ways and means of elimination. First reap the low hanging (simple and easy) benefits and then work upon higher, difficult and more benificial aspects!
for further specific help, you may write to me deirectly, in detail.
20th May 2007 From India , Delhi