Table 1.

Research questionnaire adapted version, where grouped questions are shown

Question code	Question	Direction of question (positive +, negative –)
Section 1
D1	Where do you work?	Not applicable
D2	How many years have you been working in this company?	Not applicable
D3	Which best describes your employment status?	Not applicable
D4	How many hours per week do you usually work?	Not applicable
Section 2 RQ1: To what extent do employees favor safety over productivity?
SP1	Occasional breach of workplace safety rules is needed to meet work demand	–
SP2	Lack of appropriate work tools will lead to task stoppage and inquiring for proper tools at the expense of task duration	+
SP3	Lack of complete knowledge in using a particular machine/tool will slow down working pace	+
SP4	Asking colleagues for help is required when skills to operate a machine or tool are missing, although this will prolong accomplishment of tasks	+
SP5	Demands for faster delivery of aircraft parts will decrease focus on the process	+
SP6	Observation of all safety rules will cause late delivery of tasks	–
SP7	Spending more time on a single task due to safety concerns is negative, because it will prevent completion of the work package in time	–
SP8	Use of appropriate safety clothes/gear might slow down working pace	+
Section 3 RQ2: To what extent are employees aware of the effects of safety rules and human factors on their tasks?
HF1	Performance of work tasks in the presence of distractions will lead to errors	+
HF2	Learning from mistakes that lead to poor quality of work is part of performance improvement	+
HF3	It is better to pay more attention to work than surroundings inside the workshop (equipment, tools, other people, etc.)	–
HF4	Commission of workplace rule infraction is usually conscious	+
HF5	Repetitive tasks cause less focus on the process	+
HF6	Work errors are caused only when people interact with other parts of their working environment	–
HF7	Wrong positioning of hands, arms, or body during a job prevents it from being done properly	+
HF8	Ability to spot when others infringe safety rules is important	+
HF9	Work pressure leads to unpredictable errors	–
HF10	Understanding why rules must be followed when performing tasks is important	+
HF16	Working at a convenient pace prevents injuries caused by equipment and machinery	+
HF17	Numerous steps for completing a task will inevitably jeopardize exercise of safety rules	–
HF18	Few doubts about how to use a machine must not lead to stoppage of task performance	–
Section 4 RQ3: How sufficiently do managers and supervisors communicate with employees regarding human factors and safety?
HF11	Management of my company provides workers with enough information to make us aware of human error problems at the workplace	+
HF12	The supervisors of my company regularly talk to employees about work safety practices and rules	+
HF13	The supervisors of my company talk to workers about safety aspects of newly introduced tasks	+
HF14	Supervisors of my company pass safety concerns of employees to management	+
HF15	Management of my company sometimes does not make practical rules about safety, because managers have a limited understanding of the processes that workers use to perform tasks	–
SP9	At my company, employees communicate their difficulties in meeting production deadlines to supervisors	+
SP10	At my company, workers communicate the cases of errors that require repetition of tasks from the beginning to supervisors	+
SP11	Discussion with supervisors about work related issues is sometimes avoided, because it will lead to late accomplishment of tasks	–
SP12	The safety rules of my company are adequately discussed with all employees before the start of tasks, so time is not spent on access to such information at the expense of timely completion of tasks	+