Peter Checkland

Person · Open Library

Died

2026-05-17

Works

9

via Open Library + Wikidata

Music · MusicBrainz

Type

Person

Gender

Male

Origin

Austria

Active from

1926-06-30

Active to

2011-02-12

via MusicBrainz · CC0

Recent publications · Crossref

5 total works indexed

1. Cutoff criteria for fit indexes in covariance structure analysis: Conventional criteria versus new alternatives

   · 1999 · cited 87,375x

2. A new method of classifying prognostic comorbidity in longitudinal studies: Development and validation

   · 1987 · cited 42,806x

3. QIIME allows analysis of high-throughput community sequencing data

   · 2010 · cited 30,945x

4. RoB 2: a revised tool for assessing risk of bias in randomised trials

   · 2019 · cited 25,538x

5. The ERA5 global reanalysis

   · 2020 · cited 24,174x

via Crossref · CC0

Quotes

• “We have no aces to what the world is, to ontology, only to descriptions of the world... that is to say, epistemology... We should never say something in the world: 'it is a system'; only: "it may be described as a system'.”
• “We reduce the complexity of the variety of the world in experiments whose results are validated by their repeatability, and we may build knowledge by the refutation of hypotheses.”
• “A methodology will lack the precision of a technique but will be a firmer guide to action than a philosophy. Where a technique tells you 'how' and a philosophy tells you 'what', a methodology will contain elements of both 'what' and 'how'.”
• “In a certain sense human activity systems do not exist, only perceptions of them exist, perceptions which are associated with specific Ws.”
• “The core of a root definition of a system will be a transformation process (T), the means by which defined inputs are transformed into defined outputs. The transformation will include the direct object of the main activity verbs subsequently required to describe the system.”
• “Making drawings to indicate the many elements in any human situation is something which has characterized SSM from the start. Its rationale lies in the fact that the complexity of human affairs is always a complexity of multiple interacting relationships; and pictures are a better medium than linear prose for expressing relationships. Pictures can be taken in as a whole and help to encourage holistic rather than reductionist thinking about a situation.”

via Wikiquote · CC BY-SA

Key dates

Died

17 May 2026

via Wikidata · CC0