BPT is a methodology of testing which is similar to Key Word methodology in that utilizing QTP and it's Key Word feature a scriptor develops the automated scripts as a library of sub-routines or modules such as one module might be Login. This Login module, if run by itself could perform the entire login process on your application. The theory is that the BA's can take these modules and use them like building blocks to create a test case which will be automated. The automation scriptors build new modules and maintain the old ones while the BA's write the automated scripts. Neat huh? The truly neat thing is that it works! We have a very large investment company nearby who does all their SW testing this way.