The Gross Task Analysis lists every step performed in a given task. Additional detail can then be defined for each of these steps.
Some common and useful information typically addressed in a gross task analysis include tools and time. What equipment is needed to perform a given step and how long the step will take to complete are listed with the step.
It is best to learn by example. Here is what a gross task analysis for brushing your teeth might look like. Note: this assumes your work site is already setup with all needed equipment.
- Tools: Toothbrush, toothpaste, water source (faucet), sink, glass, towel
- Unscrew toothpaste cap (15 seconds)
- Squeeze toothpaste onto toothbrush bristles (15s)
- Turn faucet on (5s)
- Wet toothpaste (2s)
- Brush teeth (120s)
- Brush tongue (10s)
- Fill glass with water (3s)
- Rinse mouth (5s)
- Spit (1s)
- Wipe mouth (5s)
- Rinse sink (5s)
- Turn faucet off (2s)
- Dry hands (3s)
- Dry mouth (3s)
If needed, these steps can be broken down further to the elemental actions required to perform the task. Usually only steps identified as critical are broken down to this level. This is called a Critical Task Analysis.
Critical is usually defined as being necessary for mission success. A step that is physically impossible to perform, requires to much time or money, has a high likelihood of needing repair or replacement, etc., can all cause a step to become critical.
In this example the steps involving toothpaste and brushing are critical. If you can not unscrew the cap you can not get the toothpaste so you can not brush your teeth which means you can not complete the task. Rinsing you mouth and drying your hands are not critical to completing the task.
