Can be hard to measure in LICs due to lack of monitoring
War zones and squatter settlements are difficult areas to measure literacy rates
Increasingly people are seeking medical help and advice via mobile phone – this is becoming popular in places like India and is not included in the data
Data is not always reliable, especially in LICs
It can be slightly misleading in countries with very high rates of infant mortality as people surviving infancy may live longer than expected
In the poorest countries, not all the deaths of children are reported, especially in remote areas, meaning the true rates may be even higher
Data collection in LICs is not likely to be accurate and so official figures may underestimate the problem
People may technically have access but high costs may force them to use water that is not safe
Pipe leaks and natural disasters may deprive people of mains water
Some countries may have low birth rates but are actually quite poor
Birth control policies can distort this as a measure of overall development
Death rates can be high in some LICs due to poverty but also high in HICs where many people are dying of old age
Only takes into account one factor – income
As it is an average calculation a few wealthy people could distort the results
People working in the informal sector may not be taken into account
It is based on average calculations so doesn't take into account the massive disparities (differences) that may exist within a country