“…Svensson and Angelborg-Thanderz (1997) also found that pilot mental workload was affected by task difficulty. Particularly, the statistical analysis of the data collected in long-term spaceflights has revealed the relationship between astronaut errors frequency and task complexity (Nechaev et al, 1998). Of course, the above studies do not mean that human error should be blamed on Note: COSS -complexity of operation step size; COLS -complexity of operation logic structure; COII -complexity of operation instrument information; and CSMIcomplexity of space mission information.…”