Construct · 2 fields · 2 citations

Where does availability collide?

One name. Different field. Different construct. One map.

● jingle · one word, two constructs Nearest construct by meaningavailability heuristiccompare the meanings
How to read this

Every construct on the map is compared with every other by the meaning of its definitions, and the closest one is surfaced here. The nearest construct to availability is availability heuristic.

Hold this as a prompt, not a verdict. Two constructs sitting close in meaning is a reason to read them side by side and decide for yourself whether they are one idea under two names. It is not proof that they are. Compare the meanings in the Collider.

availability2 CONSTRUCTSSystem uptimeAVIZIENIS · UPTIME RATIOResource supplyCHAPIN · ACCESSIBLE SUPPLY

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1980Resource supply2004System uptime
2026

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Reliability engineering

the proportion of time a system is functioning and ready to deliver correct service.

In reliability and dependability engineering, availability is the proportion of time a system is in a functioning, operable state and ready to deliver correct service. Avizienis, Laprie, Randell, and Landwehr's 2004 taxonomy of dependable computing defined it as readiness for correct service, one of the core attributes of dependability alongside reliability and maintainability. For a repairable system it is often written as A = MTBF / (MTBF + MTTR), and steady-state availability is quoted in the 'nines', so that 99.999 percent uptime allows only minutes of outage a year. The referent is an operational service-level metric of a machine or service, not a bias in human judgment or a supply of resource in an ecosystem.[1]

Unit
The fraction of time a system is up and ready, from 0 to 1 or as a percentage
Recovery means
Restored by repair: a shorter mean time to repair raises availability even when failures still occur
Measured by
Computed from observed uptime and downtime, or from MTBF and MTTR, and reported as a percentage or in nines

Plant and soil ecology

the amount of a resource such as water, light, or a nutrient actually accessible to organisms, not its total abundance.

In plant and soil ecology, resource availability is the amount of a resource, such as water, light, or a mineral nutrient, that is actually accessible to organisms, as distinct from its total abundance in the environment. Chapin's 1980 review of the mineral nutrition of wild plants stressed that a soil may hold large stocks of nitrogen or phosphorus while only a small, chemically accessible fraction can be taken up, so uptake tracks the available pool rather than the total. Availability is set by chemical form, solubility, and the rate at which a resource is supplied and renewed, which is why bioavailable nitrogen can be scarce in a nitrogen-rich soil. The referent is a physical supply accessible to living things, not a system's uptime or a quirk of human memory.[2]

Unit
The accessible amount of a resource per unit area, volume, or time, distinct from total stock
Recovery means
Replenished as weathering, decomposition, and mineralisation renew the accessible pool
Measured by
Estimated by extractable or bioavailable fractions in soil and water assays and by uptake and supply rates

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Nearby collisions

availability heuristic1 fields · 2 citationsanchor · a standalone constructrobustness6 fields · 14 citationsjingle · one name, six constructsuptake3 fields · 3 citationsjingle · one word, three constructs

References

  1. Avizienis, A., Laprie, J.-C., Randell, B., & Landwehr, C. (2004). Basic concepts and taxonomy of dependable and secure computing. IEEE Transactions on Dependable and Secure Computing, 1(1), 11–33. https://doi.org/10.1109/TDSC.2004.2
  2. Chapin, F. S., III. (1980). The mineral nutrition of wild plants. Annual Review of Ecology and Systematics, 11, 233–260. https://doi.org/10.1146/annurev.es.11.110180.001313

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