Problem $1$:

The accounts receivable department has documented the following defects over a $30-$day period:

$\backslash$table$[[$Category$,$Frequency$],[$Invoice amount does not agree with the check amount,$108],[$Invoice not on record $($not found$),24],[$No formal invoice issued,$18],[$Check $($payment$)$ not received on time,$30],[$Check not signed,$8],[$Invoice number and invoice referenced do not agree,$12]]$

What techniques would you use and what conclusions can you draw about defects in the accounts receivable department?

Problem $2$:

Prepare a flow chart for purchasing a Big Mac at the drive$-$through window at McDonalds.

Problem $3$:

Draw a fishbone chart detailing reasons why a part might not be correctly machined.