## 4 Results
### Identification and Description of Error Modes
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Task Step** & **Task Description** & **Error Mode** & **Error Description** & **Consequence** & **Recovery** & **Remedical Strategy** \\ \hline \multirow{3}{*}{1.1} & \multirow{3}{*}{Read work instructions} & R2: Wrong information & Improper interpretation & A wrong mental representation of & & Improve work instructions: \\  & & obtained. & of drawings. & the task to be completed leading & & \multirow{3}{*}{None} & \multirow{3}{*}{\begin{tabular}{c} Improve instruction delivery systems. \\ \end{tabular} } \\  & & R3: Information & Incomplete reading of & to improper execution. & & Improve instruction delivery systems. \\ \hline \multirow{3}{*}{1.2} & \multirow{3}{*}{Pick the bracket from} & S2: Wrong selection made. & Selection of a different & & A different bracket installed. & \multirow{3}{*}{Step 3} & \multirow{3}{*}{\begin{tabular}{c} Clearly identifiable and labeled bins or validation with a barcode system. \\ Introduction of fitting feeding system. \\ \end{tabular} } \\  & bins at workstation & As Operation omitted. & Bracket on picked. & A missing bracket in the assembly & & \\ \hline \multirow{3}{*}{1.3} & \multirow{3}{*}{Pick fasteners from bins at the workstation} & S2: Wrong selection made. & Selection of a & A different fixer installed, & \multirow{3}{*}{Step 1.4} & \multirow{3}{*}{\
\begin{tabular}{c} Better tracking and guidance during the assembly process. \\ Introduction of fitting feeding system. \\ \end{tabular} } \\  & at the workstation & As Operation omitted. & Fasteners on picked. & A missing listener in the assembly. & & \\ \hline \multirow{3}{*}{1.4} & \multirow{3}{*}{Fix the bracket in} & \multirow{3}{*}{Fix the bracket in} & A3: Operation in & & \multirow{3}{*}{
\begin{tabular}{c} Bracket installed in the wrong direction. \\ wrong direction. \\ ASR. Unaligned & & & & \\ \end{tabular} } \\  & proper position. & A5: Misalign. & & & & \\ \cline{1-1}  & & & & & & \\ \cline{1-1}  & & & & & & \\ \cline{1-1}  & & & & & & \\ \hline \multirow{3}{*}{2.} & \multirow{3}{*}{Apply required torque.} & A4: Too little/ & Torque applied but out & & & \\ \cline{1-1}  & & & & & & \\ \cline{1-1}  & & & & & & \\ \cline{1-1}  & & & & & & \\ \cline{1-1}  & & & & & & \\ \cline{1-1}  & & & & & & \\ \hline \multirow{3}{*}{3.} & \multirow{3}{*}{Check assembly} & C1: Check omitted. & & & & \\ \cline{1-1}  & C2 Check incomplete. & & & & & \\ \cline{1-1}  & & & & & & \\ \cline{1-1}  & & & & & & \\ \hline \hline \end{tabular}  
* Similar tables were obtained as a result of the SHEPAR analysis for the other two critical tasks. The consolidated results of the identified error modes for the three critical tasks are presented in Table 3. Mitigation strategies are addressed in more detail in the discussion section of this paper. R2. S3. 2, etc., correspond to error code in the SHEPAR taxonomy.  
\end{table} 
Table 2: SHEPAR output-human error analysis table for critical task No.1 (install brackets) 1. A3 Operation in the wrong direction: The six errors in this category were identified in the installation of brackets and the installation of cushioned loop clamps (secure data cable). All these parts must follow a specific spatial orientation according to drawings shown in the assembly instructions. A4 Too little/much operation: Fasteners must be tightened by applying torque with a specific amount of force. An operation is considered out of specifications if the fastener is too loose or too tight. Five bolts are required to install brackets, which accounts for the five error modes in this category. A5 Misalignment: Like operation in the wrong direction (A3), misalignment is especially prevalent during the installation of brackets and cushioned loop clamps. A bracket can be fastened to one of several holes. It is, therefore, possible to install a bracket in a shifted position from the one specified on the instructions. Cushioned loop clamps are also subject to this kind of error mode because the correct position of the cushioned loop clamps could be hard to determine.