The document discusses evaluating investigations by assessing the strengths and weaknesses of data collection methods, the accuracy of results, and validity of conclusions. Effective evaluations observe how limitations of methods likely impacted conclusions. Weaker ones simply list problems. Higher levels of evaluation clearly link method limitations to inaccurate results and how these could lead to invalid conclusions. Evaluators should consider questions like how well data addressed the aims, whether different collection methods could improve accuracy and usefulness, and how problems may have affected conclusions. The key is linking the three evaluative elements of methods, accuracy, and conclusions.