This thesis is a paper-based thesis. Using a large-scale matched employee-employer dataset, three empirical studies were undertaken to empirically examine: 1) the relationship between employee attitudes, human resource management practices and firm performance in SMEs; 2) the effect of the firm size on firms’ and employees’ experience during the recent financial crisis, particularly firm’s employment related responses to the economic hardship; and 3) the impact of firm size on employee’s experience of work stress during economic recession. The findings of the first study suggest a direct relationship between HRM practices and SME firm performance, but this relationship is moderated by high employee job satisfaction. The results suggest tha...