A flowchart is used to$.$

QUESTION $2$SELECT ONE OR MORE:

a$.$

Study a process

b$.$

Analyse potential causes of faults and problems.

c$.$

Collect data from targeted customer groups.

d$.$

Identify and investigate possible causes.

e$.$

Separate significant data from the trivial.

f$.$

Alert an operator to special causes.

g$.$

Experiment with a process.

h$.$

Analyse and optimise a process.