For most groups of organisms, there appear to be substantial proportions of Australia where species and populations are in a good to very good state. However, in the assessment summary, in these cases, if there is also a substantial proportion where the state is considered to be poor or very poor, one of these grades is assigned. The presence of half circles in the confidence in grade and confidence in trend columns in the summary table usually indicates that direct data on grade or trend are limited, but that consensus is high or moderately high. This consensus comes about because the limited grade or trend data for a sample of species is complemented by data on pressures and ecological research on the likely effects of those pressures. The period over which assessments of trends is made varies depending on the data available—it is at least a decade in most cases.