Read the topic - What is Structured OJT? 

Training Goldmine: Armed with a well-designed OJT package, some training in training others, and a good attitude, a solid performer can make a great OJT trainer. 

If expert employees do not have the interest, skill, or time to train others, do not select them to be OJT trainers. Sometimes expert employees aren't able to train other employees at all. Not everyone can be a trainer. 
 
Trainer Skills  
Managers/supervisors sometimes select OJT trainers who have neither the attitude nor ability to train, but it's critical to remember that job knowledge (by itself) is not enough. 

Trainer skills can be developed through "train-the-trainer" instruction or consultation with training specialists, but a candidate needs to start with: 

- generosity in sharing job knowledge with others. 
- the respect of subordinates, peers, and management. 
- interpersonal skills (can communicate ideas clearly and in a non-intimidating way). 
- the discipline required to follow the structure in OJT. 
- a positive attitude about the organization and the work performed. 

The Certification and Training Group can help you prepare OJT trainers to train. Training others is a big responsibility; you owe it to your trainers to arm them with the proper tools for the job.