Collecting data for emotional factors

Emotional factor methods

Emotional factor methods keep a record of feelings experienced within a performance. Reactions such as happiness, sadness, anger, fear, trust and surprise can affect the performance.

Data collection for emotional factors can include questionnaires, self reflective targets, and disciplinary records. By keeping a record of how many fouls a football player picks up or the number of times the referee has had to discipline a player, the data collected would demonstrate the level of self-control a performer shows.

Disciplinary record for a football player, showing red and yellow cards and details of events in the match
Figure caption,
Disciplinary record for a football player
Student filling in an emotional questionnaire on their computer. Questions have always, sometimes never radio button answers
Figure caption,
Emotional Questionnaire

Question

How do emotional factor methods ensure accuracy and reliable results?