Enumeration in longtable misaligns second column

Question

In the image below, I'm trying to figure out how to horizontally align (a) to be in line with Implications. Effectively, have (a) start where xxx is. What am I doing wrong?

\begin{longtable}{p{2.5cm}p{12cm}}
    Statement: & These principles of information management apply to all organizations within the enterprise. \\
    Rationale: & The only way we can provide a consistent and measurable level of quality information to decision-makers is if all organizations abide by the principles. \\
    Implications: & xxx
        \begin{enumerate}[label={(\alph*)}]
            \setlength\itemsep{0.5em}
            \item Without this principle, exclusions, favoritism, and inconsistency would rapidly undermine the management of information
            \item Information management initiatives will not begin until they are examined for compliance with the principles
            \item A conflict with a principle will be resolved by changing the framework of the initiative
        \end{enumerate}
    \end{longtable}

Answer 1

With enumitem package is simple:

Edit: if you like to star enumerate list where is till to now been word xxxx and have it vertical aligned with text in the first column, than you need to vertical move list. For example with inserting it in minipage˛. One option, how to do this is use etoolbox` package:

\documentclass{article}
\usepackage{enumitem}         % <---
\AtBeginEnvironment{longtable}% <---
{
\setlist[enumerate]{label={(\alph*)}, 
                    align=left, 
                    leftmargin=*, 
                    itemsep=0ex,
                    after=\end{minipage},    % <---
                    before=\begin{minipage}[t]{\linewidth}\raggedright
                    }
}
\usepackage{longtable}

\begin{document}
\begin{longtable}{p{2.5cm}p{12cm}}
    Statement:      & These principles of information management apply to all organizations within the enterprise. \\
    Rationale:      & The only way we can provide a consistent and measurable level of quality information to decision-makers is if all organizations abide by the principles. \\
    Implications:   &   \begin{enumerate}
                    \item Without this principle, exclusions, favoritism, and inconsistency would rapidly undermine the management of information
                    \item Information management initiatives will not begin until they are examined for compliance with the principles
                    \item A conflict with a principle will be resolved by changing the framework of the initiative
                        \end{enumerate}
\end{longtable}
\end{document}

Is this what you after?