Family matters:
- Observation of marriage behaviour.
- Location of goods and/or people.
- Pension and custody review.
- Follow-ups, pursuits.
- Detection of drug-taking and/or gambling.
Business matters:

- Absenteeism from work.
- Feigned sick leaves.
- Unfair competition.
- Deceitfulness in work: people having more than one job.
- Work efficiency.
- References about previous jobs.
- Information escapes.
- Watching superstores.
Economic matters:
- Financial situations.
- Solvency and insolvency.
- Location of debtors and goods.
- Fraudulent bankruptcy.
- Previous distraints and executives.
Urban rents:

- Duplicity in residence.
- Breach of contract.
- Illegal subtenancy and substitution.
- Uninhabitation of houses or premises.
- Housing or premises dedicated to other aims.
Disasters, accidents:
- Checkup, verification of accidents.
- Follow-up of injured people.
Technical matters:
