Shashikala,
A few months ago, someone asked a similar question about the hierarchy of an IT Organization. I created a one-slide IT Org Chart and sent it to them. I am attaching it here. Please take a look.
The slide is divided into four quadrants. With CEO and CIO/CTO in the top center, each quadrant is headed by a VP (VP Operations, VP Product/IT Development, VP Business Management, and VP Project Offices etc.). Each VP has multiple Directors. For example, a VP Prod/IT development has Director (Applications), Director (Quality Assurance) etc. Under each Director, there are senior managers and/or managers, then the individual contributors.
With so many VPs and Directors, the Org Structure in the slide represents a large organization (with about 5000 to 15000 employees or more). However, depending on the size of your organization, you may choose to remove some roles. A typical thumb rule in management comes from the Military of various countries (the way they are organized). A people-manager would be most effective if the number of his or her direct reports does not exceed 5 to 7 people. If you have 15 people reporting to an individual manager, an ideal situation would be to promote the individual manager to a senior manager, train and promote 3 senior individual contributors to junior managers, and have four indiviuals report to each of the three junior managers. Gradually, as the organization grows and more people are hired, there will be an opportunity for the junior managers to move up the ladder into mid-level or senior managers, and the Senior Managers to move up the ladder into Director-level positions.
The slide is a bit crowded, but I tried to keep it organized. Take a look, try to follow the red arrows (for easy understanding of the hierarchy) and let me if you have any questions.
Best,
--Som G