Difficulty: Moderately Easy
Step1
Observe your co-worker's personality, noting things such as hobbies, favorite restaurants and what they typically do on the weekends.
Step2
Bring up such topics in passing conversation to gain more knowledge on what types of things they would enjoy.
Step3
Ask them about their own shopping habits and how they figure out what they want to get for everyone on their list for Christmas/the holidays. This can be important because if they say they make it a habit to never buy gift certificates because they're too impersonal and don't show any thought, then don't buy your co-worker a gift certificate.
Step4
Observe their office and take note of anything they may need or be lacking that a normal office may have like a calendar, picture frames or even a small fountain.
Step5
Think about what time period they're at in their lives. If they're recently married, gift certificates to major department stores would be greatly appreciated. If they've recently joined a book club, an Amazon gift card could be a hit.