Dear Nipuna,
There are several posts on this site related to Training Needs Analysis. You may click the following link to read one of that:
https://www.citehr.com/125103-traini...-analysis.html
Secondly, for TNA you may please concentrate on the following:
a) Customer Dissatisfaction
b) Operational failures
c) Report from Performance Appraisal of the employees
d) Organisational issues like conflict etc
e) Vision of your organisation like acquiring certification for ISO, six sigma etc.
f) Career Planning and Succession Planning.
g) Inventory Carrying Cost of raw material and also of finished goods (if you are in manufacturing sector)
In addition to this, earlier I had given comprehensive reply on Training and Development. If you do the TNA in isolation, you may not be able to measure the effectiveness of training. Seeds of measurement of training effectiveness are sowed in TNA itself. To know how to do that, you may click the following link:
https://www.citehr.com/523786-traini...-523786-a.html
Thanks,
Dinesh Divekar