Question 1 – Summary of Performance Load
What is performance load? It’s the amount of mental and physical activity required to achieve a goal. High-performance load equals performance times and errors increase as well the chances of accomplishing the goal decreases. Low-performance load equals performance times and errors decrease as well the chances of accomplishing the goal increases. There is 2 type of Performance load: Cognitive Load and Kinematic Load. (Lidwell, Holden & Bulter, 2003).
Cognitive Load is the mental usage required to finish a goal, for example in the knowledge of how we learn, think and problem solve is connected to the cognitive load (Sweller, Ayres, Kalyuga, 2011). (Hai, Rojas, Childs, Ribaupierre, & Dubrowsky, 2015) indicates that the human working memory is limited, Cognitive Load Theory (CLT) argues that performance and learning are weakened when the total cognitive load (CL) reaches working memory capacity (Hai, Rojas, Childs, Ribaupierre, & Dubrowsky, 2015). General ways to reduce cognitive load: Minimizing visual noise, chunking information that must be remembered, memory aids to assist in recall and problems solving and automating computation and memory intensive tasks.
Kinematic Load is the Physical usage required to finish a goal the amount of steps or movement, or amount of force and repetition is important to complete a task. For example in a study to reduce workplace back injuries in a lifting task, the result was that the load and the speed was important factors to the kinematic data of load and human posture, the lighter the load was the faster the load acceleration would be, but the effects of lifting a lighter load faster on your lower back can be comparable with lifting a heavy load slowly since the capability of muscle force tension is lower when muscle shortens at high speed and most common muscle injuries are linked with maximal speed in variety of sports (Lee, 2015). General ways to reduce kinematic load: Reducing the number of steps required to complete a task, minimizing range motion and travel distances and automating repetitive tasks.
Designs should minimize performance load as low as it can. Following the general ways to reduce the cognitive and kinematic load.
Haji, F. A., Rojas, D., Childs, R., Ribaupierre, S., & Dubrowski, A. (2015). Measuring cognitive load: Performance, mental effort and simulation task complexity.Medical Education, 49(8), 815-827. doi:10.1111/medu.12773
Lee, T. (2015). The effects of load magnitude and lifting speed on the kinematic data of load and human posture.International Journal of Occupational Safety and Ergonomics, 21(1), 55-61. doi:10.1080/10803548.2015.1017956
Lidwell, W., Holden, K., & Butler, J. (2003). Performance Load. In Universal Principles of Design (pp. 148‐149). Massachusetts: Rockport.
Sweller, J., Ayres, P. L., Kalyuga, S., & Ebook Library. (2011). Cognitive load theory (1st ed.). New York: Springer.