How do researchers determine what is true based on the data they collect? This question is one of the central concerns of statistics, which uses mathematical models to draw useful conclusions about the real world.

Summer courses are often an avenue used by students to attain additional certificates or qualifications outside of the normal school year. Whether they are bridging the gap between levels of study or adding to a career knowledge base, these courses can be found in almost any area of study.

Part-time learning allows one to obtain a degree or qualification even if one cannot attend school on a full-time basis. One can learn at one's own pace, gradually accumulating credits that count towards a final qualification.