Safwan, Post Classification Change Detection is a standard technique in change detection studies. If you simply search for it in Google you will get millions of results. I've attached some youtube links which answers your question. Other than that I would also recommend that you explore the 'Model Maker' tool in ERDAS Imagine which has an 'Image Difference' model in-built. Then you also have 'Two Image functions' and many more. In ArcGIS too, there are many tools like the 'Overlay' which Ramesh already mentioned and the simple 'Image Analysis' toolbar to name a few. Try them out.
Hello hav eyou performed change detection in aec gis or erdas. I too have shapefile and want to analyse chnage and create a change matrix. kindly suggest
It seems to me that change detection tool is very popular on remote sensing software but not very common on GIS softwares. For your problem, I suggest using Intersect tool in 3D Analysis package.