Personality Test

I thought it was pretty accurate, except I usually test at INFJ.

I read this papragrpah that made sense;
In their own way, INFJs are just as much "systems builders" as are INTJs; the difference lies in that most INFJ "systems" are founded on human beings and human values, rather than information and technology. Their systems may for these reasons be conceptually "blurrier" than analogous NT ones, harder to measure in strict numerical terms, and easier to take for granted -- yet it is these same underlying reasons which make the resulting contributions to society so vital and profound.

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INTJ - The "Strategist" Myers-Briggs Personality Types (Free Test)

INTJs are introspective, analytical, determined persons with natural leadership ability. Being reserved, they prefer to stay in the background while leading. Strategic, knowledgable and adaptable, INTJs are talented in bringing ideas from conception to reality. They expect perfection from themselves as well as others and are comfortable with the leadership of another so long as they are competent. INTJs can also be described as decisive, open-minded, self-confident, attentive, theoretical and pragmatic.