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A reference man: is
• Between 19 and 39 years of age
• Weighs 65 kg with a
• Height of 1.77 m and
• BMI of 20.75 and is
• Free from disease and physically fit for active work.
• On each working day, he is engaged in 8 hours of occupation which usually involves moderate activity.
• While not at work, he spends 8 hours in bed, 4–6 hours in sitting and moving about, 2 hours in walking, and in active recreation or household duties.
A reference woman: is
• Between 19 and 39 years of age

There are two main systems of piped water distribution:
1. Intermittent water supply: Water is supplied only during fixed timings during the day.
2. Continuous water supply: Water is supplied throughout the day.
Most of the cities in India have intermittent supply of water. There are certain disadvantages of the intermittent water supply.
• Water may not be available immediately during an emergency.
• Consumers need to store water. This may lead to contamination of drinking water and potential for mosquito breeding.

House fly lays its eggs usually in masses on organic matter such as manure and garbage. It looks like a heap of 120 – 130 eggs.

Hatching occurs within a few hours.

Breeding sites

Female flies deposit their eggs on decayed, fermenting or rotting organic material of either animal or vegetable origin.
1. Dung
Heaps of accumulated animal faeces are among the most important breeding sites for houseflies. The suitability of dung for breeding depends on its moisture (not too wet), texture (not too solid) and freshness (normally within a week after deposition).

POTENTIAL Mosquito breeding areas and ACTUAL mosquito breeding areas:
Mosquitoes breed (lay eggs) in accumulated water. Hence we need to look for areas where water accumulates for sufficient time period.
Some common places to check for water accumulation are as follows:
Inside the house
• Desert coolers
• Flower vase
• Potted plants
• Water tanks, cisterns, and other stored water
• Old cans, tyres, coconut shells, bottles, paper cups lying in open, etc.
Around the house
• Puddles and roadside ditches
• Open drains

 Family: It is a group of biologically related individuals living together and eating from a common kitchen.
 Nuclear (elementary) family: It consists of a married couple and their dependent children. A “new family” is a nuclear family within first 10 years of formation (marriage).
 Joint (extended) family: It consists of a number of married couples and their children living in the same household. All the men in the household are related by blood and the women are their wives, unmarried daughters or widows.

• Every living room should be provided with at least two windows with at least one of these opening directly on to an open space. If this is not the case, advise the family to use an exhaust fan.
• Measure the height and breadth of the windows and the doors.
• Calculate the area of each one by the formula: area = length × breadth.
• Total window area should be 1/5th of the floor area.
• The total area of the doors and the windows taken together should be 2/5th of the floor area.

There are no published guidelines on the adequacy of lighting and how to check for light adequacy without instruments. However, the Illuminating Engineer Society (IES) has recommended that for casual reading an illumination level of 100 lux is sufficient. Also the Government of India recommends up to 100 lux of illumination in living rooms.

Three criteria have been used commonly for judging the presence of “overcrowding”
If ANY ONE of the 3 criteria is satisfied, it is considered as 'overcrowding present'
1. PERSONS PER ROOM CRITERION
The number of persons in the household is divided by the number of rooms in the house.
The criteria for counting of persons for assessment of sufficiency of living area are as follows:
• An infant (a child under 12 months of age) is not counted.
• Children aged 1–10 years are counted as half a person each.

This is another scale for calculating the social class and is based on the monthly per capita income of the family. It has five classes (as seen in the Table below).