Most cropping paddocks in WA have lower yielding areas within paddocks that perform poorly in most years. If the agronomy and management are good, the poor yields are usually due to soil-related problems. Some of these problems can be corrected or reduced by adopting certain proven practices. However, it is important to identify and quantify the problem so that decisions can be made on whether amelioration is possible and economically feasible. The objective is to provide a simple decision tool for farmers and advisers to use in identifying and quantifying soil problems in agricultural soils in WA. It could be used outside WA by including local soil problems.