ISO/IEC 18025:2014提供了明确指定用于建模环境概念的对象的机制。为了实现这一点，指定了九个环境概念EDCS词典的集合: 1.分类:指定环境对象的类型； 2.属性:指定环境对象的状态； 3.属性值特征:指定关于属性值的信息； 4.属性枚举数:指定枚举属性状态的允许值； 5.单位:规定某些环境对象状态的定量度量； 6.单位刻度:允许陈述大范围的数值； 7.单位等价类:指定相互可比较的单位集合； 8.组织模式:用于定位共享公共上下文的分类和属性；和 9.组:共享共同上下文的概念被收集到其中。 还指定了功能接口。由于表示和编码概念需要识别概念的标准方式，ISO/IEC 18025:2014在字典中指定了标签和代码。ISO/IEC 18025:2014规定了环境现象的类别，包括但不限于以下内容: 1.抽象概念（例如，绝对纬度精度、大地方位角）； 2.空气中的微粒和气溶胶(例如，云、尘、雾、雪)； 3.动物(例如，平民、鱼、人、鲸荚)； 4.大气和大气条件（例如气温、湿度、降雨率、显热和潜热、风速和风向）； 5.测深地貌（例如，海槽、海峡、大陆架、海底平顶山、珊瑚礁、海山、水体底板区域）；6.电磁和声学现象(例如，声学噪声、频率、极化、声速分布、表面反射率)； 7.设备(例如，飞机、航天器、帐篷、火车、船只)； 8.地外现象（如小行星、彗星、行星）； 9.水文学(例如，湖泊、急流、河流、沼泽)； 10.冰(例如，冰山、冰原、冰峰、冰架、冰川)； 11.人造结构及其内部（例如，桥梁、建筑物、走廊、道路、房间、塔楼）； 12.海洋和沿海表面现象(例如海滩剖面、海流、海浪、潮汐、波浪)； 13.海底(例如珊瑚、岩石、沙子)； 14.海洋学条件(例如，发光、盐度、比重、浊度、水流速度)； 15.地貌(例如，悬崖、峡谷、岛屿、山脉、礁石、海峡、山谷地区)；16.空间（例如带电粒子种类、电离层闪烁、磁场、粒子密度、太阳耀斑）； 17.表面材料(例如，混凝土、金属、油漆、土壤)；和 18.植被(例如，农田、森林、草地、海带床、树木)。

ISO/IEC 18025:2014 provides mechanisms to specify unambiguously objects used to model environmental concepts. To accomplish this, a collection of nine EDCS dictionaries of environmental concepts are specified:
1. classifications: specify the type of environmental objects;
2. attributes: specify the state of environmental objects;
3. attribute value characteristics: specify information concerning the values of attributes;
4. attribute enumerants: specify the allowable values for the state of an enumerated attribute;
5. units: specify quantitative measures of the state of some environmental objects;
6. unit scales: allow a wide range of numerical values to be stated;
7. unit equivalence classes: specify sets of units that are mutually comparable;
8. organizational schemas: useful for locating classifications and attributes sharing a common context; and
9. groups: into which concepts sharing a common context are collected.
A functional interface is also specified. As denoting and encoding a concept requires a standard way of identifying the concept, ISO/IEC 18025:2014 specifies labels and codes in the dictionaries. ISO/IEC 18025:2014 specifies environmental phenomena in categories that include, but are not limited to, the following:
1. abstract concepts (e.g., absolute latitude accuracy, geodetic azimuth);
2. airborne particulates and aerosols (e.g., cloud, dust, fog, snow);
3. animals (e.g., civilian, fish, human, whale pod);
4. atmosphere and atmospheric conditions (e.g., air temperature, humidity, rain rate, sensible and latent heat, wind speed and direction);
5. bathymetric physiography (e.g., bar, channel, continental shelf, guyot, reef, seamount, waterbody floor region);
6. electromagnetic and acoustic phenomena (e.g., acoustic noise, frequency, polarization, sound speed profile, surface reflectivity);
7. equipment (e.g., aircraft, spacecraft, tent, train, vessel);
8. extraterrestrial phenomena (e.g., asteroid, comet, planet);
9. hydrology (e.g., lake, rapids, river, swamp);
10. ice (e.g., iceberg, ice field, ice peak, ice shelf, glacier);
11. man-made structures and their interiors (e.g., bridge, building, hallway, road, room, tower);
12. ocean and littoral surface phenomena (e.g., beach profile, current, surf, tide, wave);
13. ocean floor (e.g., coral, rock, sand);
14. oceanographic conditions (e.g., luminescence, salinity, specific gravity, turbidity, water current speed);
15. physiography (e.g., cliff, gorge, island, mountain, reef, strait, valley region);
16. space (e.g., charged particle species, ionospheric scintillation, magnetic field, particle density, solar flares);
17. surface materials (e.g., concrete, metal, paint, soil); and
18. vegetation (e.g., crop land, forest, grass land, kelp bed, tree).