Political

Legal
Regulatory
Economic
Social
Technological
Industry sector
Environmental 

Government action on a regional, national or international scale.
Changes in common law, statute law, or international law.
Health and safety, equal opportunities, planning regulations.
Inflation, unemployment, interest/exchange rates.
Women's rights, minority groups, increasing longevity.
Information technology, the internet, robotics, automation.
Associations, alliances, common interest groups, competition.
Global warming, emission of harmful gases, waste disposal.