The thing which moves forex:
Foreign Exchange is affected by various economic and political factors. The largest fluctuations in currency prices usually occur during Central Bank intervention, when governments trade in huge amounts forex in an attempt to either raise or lower the value of their own currency. This, aswell as many other factors such as interest rate changes, economic figures, political instability and large lot transactions by hedge funds can move the market.

How can you predict the future fx moves?
There are two major ways to analyze financial markets: fundamental analysis and technical analysis. Fundamental analysis is based upon underlying economic conditions, while technical analysis uses historical prices to predict future movements. There is an ongoing debate as to which methodology is more successful. Short-term traders prefer to use technical analysis, focusing their strategies primarily on price action, while fundamental traders focus their efforts on determining a currency's proper valuation, as well as future valuation. It is important to take into consideration both strategies, as fundamental analysis can explain technical analysis movements such as breakouts or trend reversals. Technical analysis can explain fundamental analysis, especially in quiet markets, causing resistance in trends or unexplainable movements.

Fundamental analysis
Fundamental analysis comprises the examination of macroeconomic indicators, asset markets and political considerations when evaluating a nation’s currency in terms of another. Macroeconomic indicators include figures such as growth rates; as measured by Gross Domestic Product, interest rates, inflation, unemployment, money supply, foreign exchange reserves and productivity. Asset markets comprise stocks, bonds and real estate. Political considerations impact the level of confidence in a nation’s government, the climate of stability and level of certainty.

Aside from technical analysis, another primary approach to analyzing currency market fluctuations is called fundamental analysis. Fundamental analysis is the examination of economic indicators, asset markets and political considerations when evaluating a nation's currency in terms of another. The key to fundamental analysis is to gather and interpret this information and act before the information is incorporated into the currency price. The lag time between an event and its resulting market response presents a trading opportunity for the fundamentalist.

Here some major fundamental factors that can affect currency prices:

Decisions on interest rates made by central banks such as the US Federal Reserve or the European Central bank (ECB) monthly.
Quarterly GDP figures. Only preliminary national GDP figures generally have the effect of changing market sentiment.
Market sentiment data. Market expectations are formed from one week to two days before the event. Participants establish positions based on expectations, and realize the results after the figures are released.
Political Events. National elections, the September 11th attacks, and the war in Iraq are examples of events that have affected currency values.
Major indices. Inflation indices, Institute of Supply Management (ISM) in the US and the Purchasing Management Index (PMI) in Europe are also carefully followed by traders.
National industrial production figures.
US nonfarm payrolls (indicating new jobs created), Michigan sentiment figures in the US, the western German business climate or IFO index, and the Tankan quarterly survey in Japan.

Currency interventions have a notable and oftentimes temporary impact on forex markets. A central bank could undertake unilateral purchases/sales of its currency against another currency; or engage in concerted intervention in which it collaborates with other central banks for a much more pronounced effect. Alternatively, some countries can manage to move their currencies, merely by hinting, or threatening to intervene.

Technical Analysis
Technical analysis examines past price and volume data to forecast future price movements. This type of analysis focuses on the formation of charts and formulae to capture major and minor trends, identify buying/selling opportunities assessing the extent of market turnarounds. Depending upon your time horizon, you could use technical analysis on an intraday basis (5- minute, 15 minute, hourly), weekly or monthly basis

Money managers, traders and investors who seek ways to outperform the market must also remain flexible and innovative. A method that works today does not mean it will work tomorrow.

The Beginning of Technical Analysis
At the turn of the century, the Dow Theory laid the foundations for what was later to become modern technical analysis. Dow Theory was not presented as one complete amalgamation, but rather pieced together from the writings of Charles Dow over several years.

Technical analysts believe that the current price fully reflects all information. Because all information is already reflected in the price, it represents the fair value and should form the basis for analysis. After all, the market price reflects the sum knowledge of all participants, including traders, investors, portfolio managers, market strategist, technical analysts, fundamental analysts and many others. It would be folly to disagree with the price set by such an impressive array of people with impeccable credentials. Technical analysis utilizes the information captured by the price to interpret what the market is saying with the purpose of forming a view on the future.

A technician believes that it is possible to identify a trend, and market turning points, invest or trade based on the trend and make money as the trend, or turning points unfolds. Because technical analysis can be applied to many different timeframes, it may be possible to spot both short-term and long- term trends.

What is more important than Why?
It's been said, "A technical analyst knows the price of everything, but the value of nothing". Technicians, as technical analysts as they are called, are only concerned with two things:

What is the current price?
What is the history of the price movement?

The price is the end result of the battle between the forces of supply and demand for any particular item. The objective of analysis is to forecast the direction of the future price. By focusing on price and only price, technical analysis represents a direct approach. Fundamentalists are concerned with 'why' the price is what it is. For technicians, the 'why' portion of the equation is too broad and many times the fundamental reasons given are highly suspect. Technicians believe it is best to concentrate on 'what' and never mind why. Why did the price go up? It is simple, more buyers (demand) than sellers (supply). After all, the value of any item is only what someone is willing to pay for it. Who needs to know why? You may never know why.

Many technicians employ a broad-based, longer term, macro, long-term analysis first. The larger parts are then broken down to base the final step on a more focused/micro short-term, perspective. Such an analysis might involve three steps:

Broad market analysis through the major indices such as the S & P 500, Dow Industrials, NASDAQ and NYSE Composite, or Commodity Futures Index, or other broad indexes of various types.
Group analysis to identify the strongest and weakest groups within the broader market groupings, i.e. Indexes, Meats, Grains, Currencies, Metals, Energies, etc.
Individual analysis to identify the strongest and weakest within each group.

The beauty of technical analysis lies in its versatility. Because the principles of technical analysis are universally applicable, each of the analysis steps above can be performed using the same theoretical background. You don't need an economics degree to analyze a market index chart or commodity group. Charts are charts. It does not matter if the timeframe is 2 days or 2 years. It does not matter if it is a, market index, currency or commodity. The technical principles of support, resistance, trend, trading range and other aspects can be applied to any chart. While this may sound easy, technical analysis is by no means easy. Success requires serious study, dedication and an open mind. Technical analysis can be as complex or as simple as you want it.

Overall Trend:
The first step is to identify the overall trend. "The trend is your friend". This can be accomplished with trend lines, or moving averages, or both. A Moving Average (MA) is an average of data for a certain number of time periods. It "moves" because for each calculation, we use the latest "x" number of time periods' data. As long as the price remains above its uptrend line, or selected moving average or previous lows, the trend should be considered bullish. The trend theory holds that an uptrend remains intact as long as each successive intermediate high is higher than those preceding it and each reaction low stops and holds at a higher point than did earlier reaction lows. Conversely, a downtrend prevails when each intermediate decline allows prices to fall below previous lows and rallies fall short of earlier rally highs.

Support and Resistance Areas:
Support and resistance levels are unquestionably among the most important of all technical considerations. They are areas, which prices are expected to have difficulty moving above and beyond (resistance and support), and they therefore deserve especially careful considerations in buying and selling decisions. Support areas are areas of price congestion or previous lows, below the current price, which mark support levels. A break below support would be considered bearish. Resistance areas are areas of congestion or previous highs above the current price which mark resistance levels. A break above resistance would be considered bullish. The basic idea behind resistance and support theory is simply that price levels that were significant in the past will have significant impact on price action in the future.

Random Walk Theory:
The basic "random walk premise" is that price movements are totally random. Prices move at random and adjust to new information as it comes available. The adjustment to this new information is so fast that it is virtually impossible to profit from it. Furthermore, news and events are also random and trying to predict these (fundamental analysis) is also a lesson in futility. While there are some good points to be gleaned from the random walk theory, it appears to be a bit dated and does not accurately reflect the current investment climate. Random walk theory was introduced over 25 years ago when institutions dominated the market. These institutions had superior access to resources and the individual was at the mercy of the large brokerage houses for quality research. With the advent of online trading, power and influence are shifting from the institutions to the individual. Resources are now widely available to all at minimal cost, if not free. Not only can individuals access information, but the internet ensures that everyone will receive it almost instantaneously. They also have access to real time data and can trade like the pros. With the availability of real time data and almost instant executions, individuals can act on information like never before.