Hundreds of coping strategies have been identified. Classification of these strategies into a broader architecture has not been agreed upon. Researchers try to group coping responses rationally, empirically by factor analysis, or through a blend of both techniques. In the early days, Folkman and Lazarus split the coping strategies into four groups, namely problem-focused, emotion-focused, support-seeking, and meaning-making coping. Weiten has identified four types of coping strategies: appraisal-focused (adaptive cognitive), problem-focused (adaptive behavioral), emotion-focused, and occupation-focused coping. Billings and Moos added avoidance coping as one of the emotion-focused coping. Some scholars have questioned the psychometric validity of forced categorisation as those strategies are not independent to each other. Besides, in reality, people can adopt multiple coping strategies simultaneously.