Use 'allow for' when you anticipate unknown factors or changes that could affect your plans.

Expect Uncertainty

'Allow for' often expresses the need to give extra time or resources because things may not go as planned.

Margin of Error

Use this phrase when precise figures aren't possible and estimates must be included.

Indicates that a situation or system is designed to be improved or expanded in the future.

The phrase can suggest that an action is not only possible but can be done with less difficulty.

Implies that during planning, specific areas are set aside for future use or needs.

Speaks to practical foresight in planning, providing for what might be necessary later on.

Suggests planning so that there is the possibility to increase size, number, volume over time.