Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Program animation or Stepping refers to the very common debugging method of executing code one "line" at a time. The programmer may examine the state of the program, machine, and related data before and after execution of a particular line of code. This allows evaluatation the effects of that statement or instruction in isolation and thereby gain insight into the behavior (or misbehavior) of the executing program. Nearly all modern IDEs and debuggers support this mode of execution. Some Testing tools allow programs to be executed step-by-step optionally at either source code level or machine code level depending upon the availability of data collected at compile time. Instruction stepping or single cycle also referred to the related, more microscopic, but now obsolete method of debugging code by stopping the processor clock and manually advancing it one cycle at a time.

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