ISO/IEC 9995为所有字母数字键盘和数字键盘的布局定义了一个框架，涵盖了当今和未来使用键盘的最广泛的应用。要由键盘执行的功能被分成三个类别，这三个类别对应于键盘的主要物理部分。ISO/IEC 9995在键盘设计中的应用将通过将键盘划分为功能区和部分并将功能分配给按键，为用户提供统一的、可预测的人机界面。ISO/IEC 9995-2:20 09规定了键盘的字母数字部分以及该部分的分区；字母数字部分的字母数字区ZA0中的键的布置、数量和位置；以及对字母数字部分的功能区中的键的几个控制功能的布局和分配。在大多数国家，字母数字区内的主要布局由国家标准或国家用法确定。ISO/IEC 9995-2:20 09提供了分配指南。

ISO/IEC 9995 defines a framework for the layout of all alphanumeric and numeric keyboards across the widest spectrum of today's and upcoming applications using keyboards. The functions to be performed by keyboards are grouped into three categories that correspond to the main physical sections of the keyboard.

Application of ISO/IEC 9995 in the design of keyboards will provide the user with a unified, predictable user-machine interface by dividing the keyboard into functional areas and sections and allocating functions to keys.

ISO/IEC 9995-2:2009 specifies the alphanumeric section of a keyboard and the division of that section into zones; the arrangement, the number, and the location of the keys in the alphanumeric zone ZA0 of the alphanumeric section; and the layout and allocation of several control functions to the keys in the function zones of the alphanumeric section.

The primary layout within the alphanumeric zone is established in most countries by a national standard or by national usage. ISO/IEC 9995-2:2009 provides allocation guidelines.