If recent literature reviews are an indication, interest in bibliographic instruction is on the rise. However, most studies have been undertaken without sufficient emphasis on evaluating study outcomes. Werking suggested that the costs in dollars and staff time involved in full-scale evaluations were the main reasons for their lack in most library instruction studies. Brewer and Hills points out that "the absence of any generally accepted criteria perhaps helps to explain the trend in library instruction to favour evaluation according to relative standards.''