When people don't do their job properly?

They don't know how to do it

In their book “Developing Management Skills”, Whetten and Cameron propose the following equation:

Performance = Ability x Motivation, where

  Ability is the team member’s aptitude as well as the training and resources available.
  Motivation is the result of desire and commitment.

Most often, lack of ability is a TRAINING and/or RESOURCE issue.  However motivated your people are, lack of training or resources keeps them from being able to apply their motivation to the job in hand.