Protection of Investment
Your exisiting infrastructure is taken into consideration & it would be preferred that that exisiting products/ applications continue to co-exist in the new environment

Return on Investment
The solution that is being recommended post detail analysis/study is clearly meeting the requirement & there is a clear benefit from the solution [which could be measured either in clear commercial terms or it could be a clear Business benefit with a notional commercial benefit]

Justifying need of the solution desired
Is the solution giving an edge to the business needs of the customer & does it justify the investment

Ensuring ‘Longevity’ of the solution/ investment
Any solution proposed should have a reasonable ‘life’ – the approach is to ensure that over the next few months, there is no reason to further invest scrapping the currently proposed investment

Ensuring ‘Quality of Service’
An solution recommended is of no benefit if it is not functioning without problems/ operational frustration. Users would use a system only if it ensures that the desired ‘Performance’ is delivered.