For all their popularity, some secretary desks fall short of comfort and ergonomics relevant to a seated working posture. Be mindful about:
Leg-room. Some secretary desks overlook this aspect totally, while some others consider it as subsidiary to physical charm. If you are going to be seated at your secretary desk for long, make sure that it sits you with straight legs (45° to torso). Also, choose a design with a footrest. This will help you work most efficiently without the fatigue factor.
If you are going to compute and write a lot on this desk, make sure that you have an unobstructed horizontal working space of at least 4' X 2 ¾'. Considering the average American height of 5'-9" (male) and 5'-4" (female), this will give optimum elbow room and working efficiency.
Modern working lifestyle has shifted most documentation, recording, and other administrative work to the computer. This means that we don't need much storage space in our working desk. Rather than many drawers and shelves, look for a design that provides space for a desktop scanner-printer or other workstation-related accessories.