Review existing customer and staff feedback to obtain information about the business. Attach proof of documents you used for information to answer this question (e.g. survey results). Review any other business performance data (such as financial or sales data) relevant to your purpose for collecting and analysing data. Review the available information. Identify any contradictory or ambiguous data and discard it (all other data should be reliable and valid). Your information must include numerical and/or financial information. Attach proof of the