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Article:

Successful Job Transitions, III: Starting a New Job

Ah-ha! versus Huh? -- Make a note of it!

Finding your way around, remembering what order to do things in, people's names, and who to go for this and that can be overwhelming at first.

If your new employer offers an on-boarding program, getting everything straight may be easier than if they expect you to learn by immersion. 

Either way, keep good notes. Your memory will be the first to suffer if you get overwhelmed.  Your performance will follow.