When a business decides it must improve its Search Engine Placement, there are many different routes which may be taken. If a website is properly optimized, it can offer free online marketing for that company. It is important, therefore, for them to select a search engine optimization company which will fulfil their needs.
If money is no issue, then companies can pay for online marketing which ensures that they always appear on the first page of an appropriate search. They would need to get in touch with search engine companies, such as Google and Yahoo! in order to discuss deals with each one, thereby ensuring search engine placement whichever search engine was used by the customer.
For a lot of companies, however, their marketing allowances are limited so the need to ensure they are attaining the best value for money is essential. Asking the following questions could be helpful:

What do I require from the SEO Company?
Do I already have a web site?
Is search engine listing the ?
Is conversion to sales the main goal?
Do I want to select a local business?
Is selecting a Search Engine Optimization Company who performs ethical systems key?

If the organisation does not have a website already, or in-house web builders, perhaps it would be a good idea to discuss with a company who designs web sites, and includes search engine optimization as part of the package. However if they do have in-house web builders, then perhaps deciding on a search engine optimization company who can discuss with their developers to ensure positive outcomes once their web site is complete would be a better decision.
For most companies, web sites will already have been constructed and search engine optimization organisations are required to develop traffic to them. Client briefs will help SEO companies to attain this, and for this reason it may be useful to decide on a search engine optimization company that is located close to your business. They will certainly want to know if search engine placement, or ensuring that your web site appears high in the search engine results, is important for the company.
Some SEO businesses are paid for optimising the web site; others on a pay per click system. This will be something to take into account when you make your final selection.
Some SEO companies do not use ethical techniques to ensure Search Engine Placement and this can result in your web site being removed from searches entirely. Ask the search engine optimization company whether it uses ethical procedures to optimize web sites.
Remember, good search engine optimization can provide lots of free Online Marketing for your company, so it is important to choose well.