SIMAPRO is a software generally used to assess the environmental impacts based on life cycle analysis concept. What are the inputs / outputs ? recent papers on the topic ?
It sound's like you are looking for background/tutorial content on SimaPro; in which case, I'd refer you to Jens' earlier response.
If you are looking to go a bit deeper, the following paper provides a critic of LCA software including SimaPro by looking at variability and uncertainty among software packages.
Article Life Cycle Assessment Software: Selection Can Impact Results