The more obvious ones relate direct

The more obvious ones relate directly to productivity. Indication that job performance is declining may include production decreases lower quality more accident and higher scrap or rejection rate. Any of these outcome might suggest that worker skill need to be find tune. Of course we are assuming that the employee performance decline is in no way relate to lack of effort. Manager too must also recognize that a constantly evolving workplace may require training. Change impose on employee as result of job redesign or a technological breakthrough also require training.
It is important to put training into perspective. Training may be costly and it should not be view as a cure-all for that ail the organization. Rather judge training by it contribution to performance where performance is a function of skill abilities motivation and the opportunity to perform. Manager must also compare the value receive from performance increases attributable to training with the costs that training incurred.