Sentence examples for difficult to establish how from inspiring English sources

They describe how the police found it "extremely difficult" to establish how many people were going to demonstrate outside the Grunwick factory and what tactics they were going to use.

The BBC said it was difficult to establish how much compensation the banks concerned had so far avoided paying their customers because "only they have access to the detailed records required for an accurate assessment".

Phil Wright, chief engineer at the inspection and insurance service Allianz Engineering, says: "It is difficult to establish how much asbestos is present in a home without employing a specialist to undertake a full inspection".

Given the problems in accessing Saudi Arabia at the best of times, let alone during hajj, it is difficult to establish how many workers are involved with the Mecca projects, where they come from, how they are treated and how closely construction firms obey the country's labour laws.

Why is it so difficult to establish how many girls are missing?

While it is difficult to establish how clusters emerge, it is evident that government support is an important factor for cluster formation (Ghadar et al., 2012).

Existing rules make it very difficult for a company seeking to build new transmission lines to establish how it will recoup its costs.

Boivin-Roumestan says it is difficult to establish exactly how many children are affected.

"For ethical reasons you can only carry out this research on dead birds – so it's difficult to establish exactly how they've died," says Thompson.

On a separate point, the report adds: "It has proved difficult to establish exactly how many working groups there are (in excess of 300), which remain relevant and what the procedures are for removing those that are no longer required".

The reported incidence of gut maladies in people with autism varies wildly between published studies from zero to more than 80% making it difficult to establish just how commonly the two conditions go together, says principal investigator Sarkis Mazmanian, a microbiologist at the California Institute of Technology (Caltech) in Pasadena.