Identify the source and reporting period
Use the published statistical release and its definitions, rather than an unattributed headline. Record whether the figure refers to a quarter, a financial year or another period. Different periods cannot be compared as if they were the same measure.
Compare the same category
A category such as burglary at non-residential premises is different from another form of crime. Check that both periods use the same definition and geographic scope. A percentage change should be considered with the underlying counts and any stated limitations.
Avoid turning a broad figure into a prediction
An aggregate trend is context, not a forecast of what will happen at your site. Local operating hours, access arrangements, incident history and physical layout all matter to a practical assessment. Statistics alone do not determine the right camera system or staffing arrangement.
Review your own records carefully
Use consistent categories for internal incidents and distinguish confirmed events from initial reports. A change in detection or reporting practice can change recorded totals. Investigate that possibility before attributing a change to rising or falling underlying risk.
Translate the review into clear requirements
Identify the areas, periods and events that need attention. Define what evidence a camera should capture and what action follows review. Combine surveillance with the organisation’s broader security procedures and response arrangements.
Keep the evidence proportionate
Do not claim a guaranteed percentage reduction in crime from a technology without appropriate evidence and a defined measurement method. The useful question is whether the proposed system addresses a demonstrated requirement and provides a reviewable operating process.