Performance Management & Organizational Behaviour

Hello All, We are an IT-firm,(basically a start-up) and we wanted a complete documentation from entry to exit of an employee(though we follow, wanted to revamp) and also on performance management, organizational behavior(OB) management, an organizational hierarchy. I know there are few tools in the market, suggest me the best.
Thank you.
waiting for the responses.

Dear Pavitra,
Very often queries on PMS on this forum. I have given reply to this post. Click the following link to refer the reply:
https://www.citehr.com/577456-formul...ml#post2228293
In the above link, you will find several other links. Go through all the links patiently. It will improve your awareness of the subject.
Sample KPI and KRA Manual: - If you wish to know the structure of format of the KPI and KRA Manual, then you may click the following link. The Excel Workbook has multiple sheets. Each sheet has KRAs for various functions. Though these are not related to your industry, overall these will give you idea the format, structure and design of the manual.
https://www.citehr.com/520630-samle-kpi-kra-manual.html
Check my following videos on Youtube:
https://www.youtube.com/watch?v=NMEjMQzYVSs
https://www.youtube.com/watch?v=fTe8Pu6yioo
For further doubts, you may call me on my mobile number.
Thanks,
Dinesh Divekar