When developing or evaluating learning, there are many data collection methods to consider. In addition, there are many criteria you should consider when making data collection method decisions. The collection of multiple types of data will allow for more confidence and validity in your conclusions.
Surveys/ Questionnaires - Strongly designed questions allow researchers to analyze responses and summarize results *low response rates
Interviews - One-on-one or focus group interviews use standard or probing questions *high response rates
Observation - A participant or non-participant in the research activity immerses himself in observing behavior and reactions of others
Psychometrics - "Self-report questionnaires, objective tests, and normative, criterion-referenced and idiogrpahic tests" (Brewerton & Millward, 2002)
Company records - Attendance, participation, operations reports, performance reviews, reports, blogs etc.
Not all research methods are appropriate or feasible in all situations. Consider the following criteria when making your decision: credibility, practicality, timeliness, accuracy, objectivity, scope, availability, cost effectiveness.
Reference:
Brewerton, P., & Millward, L. (2002). Organizational Research Methods. Thousand Oaks, CA: Sage Publications.