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Trace tables are used to allow programmers to trace the value of variables as each line of code is executed. The values of the variables are displayed in a table and assist the programmer in identifying any potential errors.

Trace tables are typically used by novice programmers to help them visualize how a particular algorithm or program works. Trace tables can also help advanced programmers detect logic errors.

To create a trace table, map out all of the variables which change (not constants) and write them down in a column in a table. Each row will then store what assignments happen as the code is run. Reading through code and noting down values in a trace table is known as a dry run .

A dry run involves a programmer working through the code of a program to trace the value of variables to see that it is used and updated as expected. A programmer will usually use a trace table to record the value of the variables as they work through the program.

A trace table is a technique used to test algorithms in order to make sure that no logical errors occur while the calculations are being processed.

Each worksheet of the trace table corresponds to an instance. Each column of the worksheet contains a value of the instance variables and local variables within the instance as well as message sending among the instances. Each row of the worksheet represents a sequence of steps at each method.

There are two main reasons that trace tables are used. The first is to determine what an algorithm does by running through it to see what happens as the algorithm runs. The second is to test the logic of an algorithm in case there are errors that are not easily spotted.