1. Users
   1. Children
      1. Recreation or play
      2. Usually designed for aesthetics rather than engineered
   2. Students
      1. Low cost form of transport, including carrying books
      2. Doesn't require passing a test
   3. Athletes
      1. Generally use a specialist bike specifically designed for particular sport
   4. Commuters
      1. Generally commute under 5 miles
      2. Requires storage for briefcase etc
2. Task
   1. Transport of goods
   2. Fitness
   3. Hobby / recreation
   4. Commuting
3. Environment
   1. All seasons - predominantely left outside exposed to weather conditions
   2. On road
   3. Off road
   4. Velodrome / racing tracks
4. Types of bikes
   1. BMX
   2. Audax / Randonneur
   3. Racing bike
   4. Mountain bike
   5. Tricycle
   6. Rickshaws (transportation of people)
   7. Tandem
   8. Folding bicycle
   9. Motorised / powered bicycle
5. Advantages
   1. Faster than walking
   2. Form of exercise
   3. Cheaper than running a car
   4. Environmentally friendly
   5. Can manouvre through traffic / congestion
6. Disadvantages
   1. Exposed to weather conditions, ie rain and snow
   2. High risk of theft
   3. Parts require maintaining/ replacing
      1. EG Tyres
      2. Brakes
      3. Chain
      4. Cassette
   4. Uncomfortable seats
   5. Can be unsafe with the presence of road traffic