(Technically, Needs, Importance levels, Zones and Infrastructural layers are also enumerated types, but due to the more central role they play, both in this ontology and to this project as a whole, they are defined on the main Ontology page.
| value | Description |
| ≤ 10 €/$ | |
| ≤ 100 €/$ | |
| ≤ 500 €/$ | |
| ≤ 1 000 €/$ | |
| ≤ 2 000 €/$ | |
| ≤ 5 000 €/$ | |
| ≤ 10 000 €/$ | |
| ≤ 20 000 €/$ | |
| ≤ 50 000 €/$ | |
When applied to the time taken to produce something or gain a skill, assume four-day weeks; when it comes to shelf-life, etc., assume full weeks.
| Duration | Description |
| 0 weeks | Instantaneous |
| 0.25 weeks | Approx. 1 day |
| 0.5 weeks | Approx. 2 days |
| 1 weeks | Approx. 1 week |
| 2 weeks | Approx. 2 weeks |
| 4 weeks | Approx. 1 month |
| 12 weeks | Approx. 3 months |
| 26 weeks | Approx. 6 months |
| 52 weeks | Approx. 1 year |
| 104 weeks | Approx. 2 years |
| 156 weeks | Up to 3 years |
| 260 weeks | Up to 5 years |
| 520 weeks | Up to 10 years |
| 1 040 weeks | Up to 20 years |
| 2 600 weeks | Up to 50 years |
| Level | Description | Time required (≥) |
| 0 - None | Every-day skills and practical knowledge should be sufficient to perform this task | 0 weeks |
| 1 - Cursory introduction | Requires some minimal familiarity; a quick introduction should be sufficient to perform this task | 0.25 weeks |
| 2 - Minimal training | Requires on the order of one to three days' training | 0.5 weeks |
| 3 - Short course | Requires on the order of one or two weeks' training | 2 weeks |
| 4 - Course | Requires an understanding of the processes and a level of practical familiarity | 12 weeks |
| 5 - Apprenticeship | Requires a systematic understanding of the processes and techniques, and an understanding of their underlying principles | 104 weeks |
| 6 - Specialisation | Requires a deep understanding of the processes and techniques, and their underlying principles | 260 weeks |
| 7 - | | 520 weeks |
| 8 - Mastery | | 1 040 weeks |
Based on the NFPA 704 Standard System for the Identification of the Hazards of Materials for Emergency Response.
| Name | Description |
| Oxidiser | |
| Corrosive | |
| Acid | |
| Alkali | |
| Use-no-water | |
| Radioactive | |
| Poison | |
| Biological hazard | |
| Name | Description |
| 0 - None | Poses no health hazard, requires no precautions, and would offer no hazard beyond that of ordinary combustible materials |
| 1 - Irritation | Exposure would cause irritation with only minor residual injury |
| 2 - Temporary Incapacitation | Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury |
| 3 - Serious injury | Short exposure could cause serious temporary or moderate residual injury |
| 4 - Death | Very short exposure could cause death or major residual injury |
| Name | Description |
| 0 - Inflammable | Materials that will not burn under typical fire conditions, including intrinsically noncombustible materials such as concrete, stone, and sand. Materials that will not burn in air unless exposed to a temperature of 820 °C for more than 5 minutes. |
| 1 - Requires considerable preheating | Materials that require considerable preheating, under all ambient temperature conditions, before ignition and combustion can occur (e.g. mineral oil, ammonia, ethylene glycol). Includes some finely divided suspended solids that do not require heating before ignition can occur. Flash point at or above 93.3 °C. |
| 2 - Requires moderate preheating | Must be moderately heated or exposed to relatively high ambient temperature before ignition can occur (e.g. diesel fuel, paper, sulfur and multiple finely divided suspended solids that do not require heating before ignition can occur). Flash point between 37.8 and 93.3 °C. |
| 3 - Flammable | Liquids and solids (including finely divided suspended solids) that can be ignited under almost all ambient temperature conditions (e.g. acetone, ethanol). Liquids having a flash point below 22.8 °C and having a boiling point at or above 37.8 °C or having a flash point between 22.8 and 37.8 °C. |
| 4 - Highly flammable | Will rapidly or completely vaporize at normal atmospheric pressure and temperature, or is readily dispersed in air and will burn readily (e.g. gasoline, acetylene, propane, hydrogen gas, diborane). Includes pyrophoric substances. Flash point below room temperature at 22.8 °C. |
| Name | Description |
| 0 - Stable | Normally stable, even under fire exposure conditions, and is not reactive with water (e.g. helium, N2, carbon dioxide) |
| 1 - Mostly stable | Normally stable, but can become unstable at elevated temperatures and pressures (e.g. propene, ammonium acetate, carbonic acid) |
| 2 - Chemically reactive | Undergoes violent chemical change at elevated temperatures and pressures, reacts violently with water, or may form explosive mixtures with water (e.g. white phosphorus, potassium, sodium) |
| 3 - Explosive (insensitive) | Capable of detonation or explosive decomposition but requires a strong initiating source, must be heated under confinement before initiation, reacts explosively with water, or will detonate if severely shocked (e.g. ammonium nitrate, caesium, hydrogen peroxide) |
| 4 - Explosive | Readily capable of detonation or explosive decomposition at normal temperatures and pressures (e.g. nitroglycerin, chlorine dioxide, nitrogen triiodide, manganese heptoxide, TNT, Picric acid) |