Here is the example: Consider a software module that is intended to accept the name of a grocery item and a list of the different sizes the item comes in, specified in ounces. The specifications state that the item name is to be alphabetic characters 2 to 15 characters in length. Each size may be a value in the range of 1 to 48, whole numbers only. The sizes are to be entered in ascending order (smaller sizes first). A maximum of five sizes may be entered for each item.

This short article from Redstone software, defines black box and white box testing in terms of their usefulness in delivering quality applications. There are many resources on the web that define these testing terms but we like this article because it goes beyond the definition and looks at the practical advantageous of using one testing techniques over the other.

Equivalence partitioning is based on the premise that the inputs and outputs of a component can be partitioned into classes that, according to the component's specification, will be treated similarly by the component. Thus the result of testing a single value from an equivalence partition is considered representative of the complete partition.

A good introduction (15 pages) to the subject of Boundary Value Analysis (BVA). This paper presents the topics in a formal, although readable, fashion. The various topics and techniques of BVA are discussed followed by an example. The paper also discusses the limitations of BVA and presents an extension of BVA; called robustness testing that tries to overcome some of BVA short comings.