OM-IND-0023: Application Instance Count (Indicator)

ID

OM-IND-0023

Formal Name

Application Instance Count

In-text Name

number of application instances

Version

1.2

Type

Base Indicator

Scale

Ratio Scale

Status

Recommended

Definition

Number of application instances within the scope of responsibility of the entity.

Components

Application Instance

cf. Application Instance (Dictionary Entry).

Entity

The organization or organizational unit for whom performance is being measured.

Scope of responsibility

An item is within the scope of responsibility of an entity when that entity owns the item, or has been delegated responsibilities in relation with the item.

Rationale

Knowing the number of application instances within an entity’s scope of responsibility is of critical importance to assure that this responsibility is fulfilled, whatever the responsibility is.

Limitations and Complexities

By definition, applications whose existence is not known cannot be accounted for. This limitation may constitute a risk in environments where data quality in inventories is not reliable.

In a complex environment with multiple entities having shared responsibilities across application instances (e.g. complex out-sourcing setups), responsibility scopes may be difficult to clarify.

Data Sources

  • Cloud Services Inventories

  • CMDBs

  • IT Applications Inventories

  • Third Parties Inventories

Formula

Let X be the set of known application instances.

Let e be the entity.

Let R be a set of responsibilities assigned to e.

Let s(X, e, R) = Y be defined as the function that returns Y, a subset of X where for each application instance y in Y, the entity e has at least some responsibility in R.

The formula for the indicator is then: i = |s(X, e, R)|

Derived Indicators


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