diff --git a/Octokit.Reactive/Clients/ObservableSearchClient.cs b/Octokit.Reactive/Clients/ObservableSearchClient.cs
index f14c80c1..c417285e 100644
--- a/Octokit.Reactive/Clients/ObservableSearchClient.cs
+++ b/Octokit.Reactive/Clients/ObservableSearchClient.cs
@@ -49,7 +49,7 @@ namespace Octokit.Reactive
         public IObservable<Issue> SearchIssues(SearchIssuesRequest request)
         {
             Ensure.ArgumentNotNull(request, "request");
-            return _connection.GetAndFlattenAllPages<Issue>(ApiUrls.SearchIssues(), request.ToParametersDictionary());
+            return _connection.GetAndFlattenAllPages<Issue>(ApiUrls.SearchIssues(), request.Parameters);
         }
 
         /// <summary>
diff --git a/Octokit/Clients/SearchClient.cs b/Octokit/Clients/SearchClient.cs
index c5420328..f0fdc890 100644
--- a/Octokit/Clients/SearchClient.cs
+++ b/Octokit/Clients/SearchClient.cs
@@ -52,7 +52,7 @@ namespace Octokit
         public Task<IReadOnlyList<Issue>> SearchIssues(SearchIssuesRequest search)
         {
             Ensure.ArgumentNotNull(search, "search");
-            return ApiConnection.GetAll<Issue>(ApiUrls.SearchIssues(), search.ToParametersDictionary());
+            return ApiConnection.GetAll<Issue>(ApiUrls.SearchIssues(), search.Parameters);
         }
 
         /// <summary>
diff --git a/Octokit/Models/Request/SearchIssuesRequest.cs b/Octokit/Models/Request/SearchIssuesRequest.cs
index 346917c6..d1464632 100644
--- a/Octokit/Models/Request/SearchIssuesRequest.cs
+++ b/Octokit/Models/Request/SearchIssuesRequest.cs
@@ -4,17 +4,19 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
+using System.Globalization;
 
 namespace Octokit
 {
     /// <summary>
     /// Searching Issues
     /// </summary>
-    public class SearchIssuesRequest : RequestParameters
+    public class SearchIssuesRequest
     {
         public SearchIssuesRequest(string term)
         {
-            Ensure.ArgumentNotNullOrEmptyString(term,"term");
+            Ensure.ArgumentNotNullOrEmptyString(term, "term");
+
             Term = term;
             Page = 1;
             PerPage = 100;
@@ -25,14 +27,13 @@ namespace Octokit
         /// The search terms. This can be any combination of the supported repository search parameters:
         /// http://developer.github.com/v3/search/#search-code
         /// </summary>
-        [Parameter(Key= "q")]
-        public string Term { get; private set; }
+        public string Term { get; set; }
 
         /// <summary>
         /// For http://developer.github.com/v3/search/#search-issues
         /// Optional Sort field. One of comments, created, or updated. If not provided, results are sorted by best match.
         /// </summary>
-        //public string Sort { get; set; } //re-add laters
+        public IssueSearchSort? Sort { get; set; }
 
         /// <summary>
         /// Optional Sort order if sort parameter is provided. One of asc or desc; the default is desc.
@@ -48,5 +49,186 @@ namespace Octokit
         /// Number of items per page
         /// </summary>
         public int PerPage { get; set; }
+
+        private IEnumerable<IssueInQualifier> _inQualifier;
+        public IEnumerable<IssueInQualifier> In
+        {
+            get { return _inQualifier; }
+            set
+            {
+                if(value != null && value.Any())
+                {
+                    _inQualifier = value.Distinct().ToList();
+                }
+            }
+        }
+
+        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1721:PropertyNamesShouldNotMatchGetMethods")]
+        public IssueTypeQualifier? Type { get; set; }
+
+        public string Author { get; set; }
+
+        public string Assignee { get; set; }
+
+        public string Mentions { get; set; }
+
+        public string Commenter { get; set; }
+
+        public string Involves { get; set; }
+
+        public ItemState? State { get; set; }
+
+        private IEnumerable<string> _labels;
+
+        public IEnumerable<string> Labels 
+        {
+            get { return _labels; } 
+            set
+            {
+                if(value != null && value.Any())
+                {
+                    _labels = value.Distinct().ToList();
+                }
+            } 
+        }
+
+        public Language? Language { get; set; }
+
+        public DateRange Created { get; set; }
+
+        public DateRange Updated { get; set; }
+
+        public Range Comments { get; set; }
+
+        public string User { get; set; }
+
+        public string Repo { get; set; }
+
+        public string MergeParameters()
+        {
+            var parameters = new List<string>();
+
+            if(In != null)
+            {
+                parameters.Add(String.Format(CultureInfo.InvariantCulture, "in:{0}", String.Join(",", In)));
+            }
+
+            if(Type != null)
+            {
+                parameters.Add(String.Format(CultureInfo.InvariantCulture, "type:{0}", Type));
+            }
+
+            if(Author.IsNotBlank())
+            {
+                parameters.Add(String.Format(CultureInfo.InvariantCulture, "author:{0}", Author));
+            }
+
+            if(Assignee.IsNotBlank())
+            {
+                parameters.Add(String.Format(CultureInfo.InvariantCulture, "assignee:{0}", Assignee));
+            }
+
+            if(Mentions.IsNotBlank())
+            {
+                parameters.Add(String.Format(CultureInfo.InvariantCulture, "mentions:{0}", Mentions));
+            }
+
+            if (Commenter.IsNotBlank())
+            {
+                parameters.Add(String.Format(CultureInfo.InvariantCulture, "commenter:{0}", Commenter));
+            }
+
+            if(Involves.IsNotBlank())
+            {
+                parameters.Add(String.Format(CultureInfo.InvariantCulture, "involves:{0}", Involves));
+            }
+
+            if(State != null)
+            {
+                parameters.Add(String.Format(CultureInfo.InvariantCulture, "state:{0}", State));
+            }
+
+            if(Labels != null)
+            {
+                foreach(var label in Labels)
+                {
+                    parameters.Add(String.Format(CultureInfo.InvariantCulture, "label:{0}", label));
+                }
+            }
+
+            if(Language != null)
+            {
+                parameters.Add(String.Format(CultureInfo.InvariantCulture, "language:{0}", Language));
+            }
+
+            if(Created != null)
+            {
+                parameters.Add(String.Format(CultureInfo.InvariantCulture, "created:{0}", Created));
+            }
+
+            if(Updated != null)
+            {
+                parameters.Add(String.Format(CultureInfo.InvariantCulture, "udpated:{0}", Updated));
+            }
+
+            if(Comments != null)
+            {
+                parameters.Add(String.Format(CultureInfo.InvariantCulture, "comments:{0}", Comments));
+            }
+
+            if(User.IsNotBlank())
+            {
+                parameters.Add(String.Format(CultureInfo.InvariantCulture, "user:{0}", User));
+            }
+
+            if(Repo.IsNotBlank())
+            {
+                parameters.Add(String.Format(CultureInfo.InvariantCulture, "repo:{0}", Repo));
+            }
+
+            return String.Join("+", parameters);
+        }
+
+        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Globalization", "CA1305:SpecifyIFormatProvider", MessageId = "System.Int32.ToString")]
+        public IDictionary<string, string> Parameters
+        {
+            get
+            {
+                var d = new Dictionary<string, string>();
+                d.Add("page", Page.ToString());
+                d.Add("per_page", PerPage.ToString());
+                d.Add("sort", Sort.ToString());
+                d.Add("q", Term + " " + MergeParameters());
+                return d;
+            }
+        }
+    }
+    public enum IssueSearchSort
+    {
+        /// <summary>
+        /// search by number of comments
+        /// </summary>
+        Comments,
+        /// <summary>
+        /// search by created
+        /// </summary>
+        Created,
+        /// <summary>
+        /// search by last updated
+        /// </summary>
+        Updated
+    }
+
+    public enum IssueInQualifier
+    {
+        Title,
+        Body,
+        Comment
+    }
+
+    public enum IssueTypeQualifier
+    {
+        PR,
+        Issue
     }
 }