For development manager, this article is probably a good reference when you are doing phone screen to eliminate non-qualifed software engineers. Steve has come up with five essential questions for first phone-screen with an software development engineer candidate:

1. Coding. The candidate has to write some simple code, with correct syntax, in C, C++, or Java.
2. OO design. The candidate has to define basic OO concepts, and come up with classes to model a simple problem.
3. Scripting and regexes. The candidate has to describe how to find the phone numbers in 50,000 HTML pages.
4. Data structures. The candidate has to demonstrate basic knowledge of the most common data structures.
5. Bits and bytes. The candidate has to answer simple questions about bits, bytes, and binary numbers.